diff --git a/ChangeLog b/ChangeLog
index 2fe7fb80..e5670533 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,12 @@
 
 What's new in version 0.6.3
 
+* Performance improvements; uses much less CPU than the
+  previous release with the default setup.
 * Use 64-bit values when storing processor times to
   avoid overflow.
+* Memory consumption improvements, compensating storage
+  of 64-bit values.
 * Internal change: rename TypedVector to Vector and
   ListBox (and related classes) to Panel.
 
diff --git a/CheckItem.c b/CheckItem.c
index 73148f32..83261237 100644
--- a/CheckItem.c
+++ b/CheckItem.c
@@ -21,11 +21,15 @@ typedef struct CheckItem_ {
 
 }*/
 
+#ifdef DEBUG
 char* CHECKITEM_CLASS = "CheckItem";
+#else
+#define CHECKITEM_CLASS NULL
+#endif
 
 CheckItem* CheckItem_new(char* text, bool* value) {
    CheckItem* this = malloc(sizeof(CheckItem));
-   ((Object*)this)->class = CHECKITEM_CLASS;
+   Object_setClass(this, CHECKITEM_CLASS);
    ((Object*)this)->display = CheckItem_display;
    ((Object*)this)->delete = CheckItem_delete;
    this->text = text;
diff --git a/CheckItem.h b/CheckItem.h
index eaf43ba6..e1ad4c9b 100644
--- a/CheckItem.h
+++ b/CheckItem.h
@@ -22,7 +22,11 @@ typedef struct CheckItem_ {
 } CheckItem;
 
 
+#ifdef DEBUG
 extern char* CHECKITEM_CLASS;
+#else
+#define CHECKITEM_CLASS NULL
+#endif
 
 CheckItem* CheckItem_new(char* text, bool* value);
 
diff --git a/FunctionBar.c b/FunctionBar.c
index 7764136c..1140267b 100644
--- a/FunctionBar.c
+++ b/FunctionBar.c
@@ -30,7 +30,11 @@ typedef struct FunctionBar_ {
 
 }*/
 
+#ifdef DEBUG
 char* FUNCTIONBAR_CLASS = "FunctionBar";
+#else
+#define FUNCTIONBAR_CLASS NULL
+#endif
 
 static char* FunctionBar_FKeys[10] = {"F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "F10"};
 
@@ -40,7 +44,7 @@ static int FunctionBar_FEvents[10] = {KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KE
 
 FunctionBar* FunctionBar_new(int size, char** functions, char** keys, int* events) {
    FunctionBar* this = malloc(sizeof(FunctionBar));
-   ((Object*) this)->class = FUNCTIONBAR_CLASS;
+   Object_setClass(this, FUNCTIONBAR_CLASS);
    ((Object*) this)->delete = FunctionBar_delete;
    this->functions = functions;
    this->size = size;
diff --git a/FunctionBar.h b/FunctionBar.h
index 2998cf7a..dfdef606 100644
--- a/FunctionBar.h
+++ b/FunctionBar.h
@@ -31,7 +31,11 @@ typedef struct FunctionBar_ {
 } FunctionBar;
 
 
+#ifdef DEBUG
 extern char* FUNCTIONBAR_CLASS;
+#else
+#define FUNCTIONBAR_CLASS NULL
+#endif
 
 FunctionBar* FunctionBar_new(int size, char** functions, char** keys, int* events);
 
diff --git a/Hashtable.c b/Hashtable.c
index 759cbef7..f971c8c2 100644
--- a/Hashtable.c
+++ b/Hashtable.c
@@ -55,7 +55,7 @@ Hashtable* Hashtable_new(int size, bool owner) {
 }
 
 int Hashtable_hashAlgorithm(Hashtable* this, int key) {
-   return (key % this->size);
+   return key % this->size;
 }
 
 void Hashtable_delete(Hashtable* this) {
@@ -116,17 +116,20 @@ void* Hashtable_remove(Hashtable* this, int key) {
       } else
          bucketPtr = &((*bucketPtr)->next);
 }
-
+//#include <stdio.h>
 inline void* Hashtable_get(Hashtable* this, int key) {
    int index = this->hashAlgorithm(this, key);
    HashtableItem* bucketPtr = this->buckets[index];
-   while (true)
+   // fprintf(stderr, "%d -> %d\n", key, index);
+   while (true) {
       if (bucketPtr == NULL) {
          return NULL;
       } else if (bucketPtr->key == key) {
          return bucketPtr->value;
       } else
          bucketPtr = bucketPtr->next;
+      // fprintf(stderr, "*\n");
+   }
 }
 
 void Hashtable_foreach(Hashtable* this, Hashtable_PairFunction f, void* userData) {
diff --git a/Hashtable.h b/Hashtable.h
index 99e06d1b..a5f2434d 100644
--- a/Hashtable.h
+++ b/Hashtable.h
@@ -47,7 +47,7 @@ inline int Hashtable_size(Hashtable* this);
 void Hashtable_put(Hashtable* this, int key, void* value);
 
 void* Hashtable_remove(Hashtable* this, int key);
-
+//#include <stdio.h>
 inline void* Hashtable_get(Hashtable* this, int key);
 
 void Hashtable_foreach(Hashtable* this, Hashtable_PairFunction f, void* userData);
diff --git a/Header.c b/Header.c
index ddd35e81..b55b557b 100644
--- a/Header.c
+++ b/Header.c
@@ -35,8 +35,8 @@ typedef struct Header_ {
 
 Header* Header_new(ProcessList* pl) {
    Header* this = malloc(sizeof(Header));
-   this->leftMeters = Vector_new(METER_CLASS, true, DEFAULT_SIZE);
-   this->rightMeters = Vector_new(METER_CLASS, true, DEFAULT_SIZE);
+   this->leftMeters = Vector_new(METER_CLASS, true, DEFAULT_SIZE, NULL);
+   this->rightMeters = Vector_new(METER_CLASS, true, DEFAULT_SIZE, NULL);
    this->margin = true;
    this->pl = pl;
    return this;
diff --git a/ListItem.c b/ListItem.c
index 13d94d00..90107e4b 100644
--- a/ListItem.c
+++ b/ListItem.c
@@ -23,14 +23,17 @@ typedef struct ListItem_ {
 
 }*/
 
+#ifdef DEBUG
 char* LISTITEM_CLASS = "ListItem";
+#else
+#define LISTITEM_CLASS NULL
+#endif
 
 ListItem* ListItem_new(char* value, int key) {
    ListItem* this = malloc(sizeof(ListItem));
-   ((Object*)this)->class = LISTITEM_CLASS;
+   Object_setClass(this, LISTITEM_CLASS);
    ((Object*)this)->display = ListItem_display;
    ((Object*)this)->delete = ListItem_delete;
-   ((Object*)this)->compare = ListItem_compare;
    this->value = String_copy(value);
    this->key = key;
    return this;
@@ -62,7 +65,7 @@ const char* ListItem_getRef(ListItem* this) {
    return this->value;
 }
 
-int ListItem_compare(const Object* cast1, const Object* cast2) {
+int ListItem_compare(const void* cast1, const void* cast2) {
    ListItem* obj1 = (ListItem*) cast1;
    ListItem* obj2 = (ListItem*) cast2;
    return strcmp(obj1->value, obj2->value);
diff --git a/ListItem.h b/ListItem.h
index 84d01027..a58db3a3 100644
--- a/ListItem.h
+++ b/ListItem.h
@@ -24,7 +24,11 @@ typedef struct ListItem_ {
 } ListItem;
 
 
+#ifdef DEBUG
 extern char* LISTITEM_CLASS;
+#else
+#define LISTITEM_CLASS NULL
+#endif
 
 ListItem* ListItem_new(char* value, int key);
 
@@ -36,7 +40,7 @@ void ListItem_display(Object* cast, RichString* out);
 
 const char* ListItem_getRef(ListItem* this);
 
-int ListItem_compare(const Object* cast1, const Object* cast2);
+int ListItem_compare(const void* cast1, const void* cast2);
 
 
 #endif
diff --git a/Makefile.am b/Makefile.am
index ccaa95fc..3cc4d916 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -27,6 +27,9 @@ ColorsPanel.c ColorsPanel.h TraceScreen.c TraceScreen.h \
 AvailableColumnsPanel.c AvailableColumnsPanel.h ColumnsPanel.c \
 ColumnsPanel.h
 
+profile:
+	$(MAKE) all CFLAGS="-pg -O2"
+
 debug:
 	$(MAKE) all CFLAGS="-g -DDEBUG"
 
diff --git a/Meter.c b/Meter.c
index 437dd681..1d447f87 100644
--- a/Meter.c
+++ b/Meter.c
@@ -104,7 +104,11 @@ typedef enum {
 #define MAX(a,b) ((a)>(b)?(a):(b))
 #endif
 
+#ifdef DEBUG
 char* METER_CLASS = "Meter";
+#else
+#define METER_CLASS NULL
+#endif
 
 MeterType* Meter_types[] = {
    &CPUMeter,
@@ -162,6 +166,9 @@ static RichString Meter_stringBuffer;
 
 Meter* Meter_new(ProcessList* pl, int param, MeterType* type) {
    Meter* this = calloc(sizeof(Meter), 1);
+   Object_setClass(this, METER_CLASS);
+   ((Object*)this)->delete = Meter_delete;
+   ((Object*)this)->display = type->display;
    this->h = 1;
    this->type = type;
    this->param = param;
@@ -169,9 +176,6 @@ Meter* Meter_new(ProcessList* pl, int param, MeterType* type) {
    this->values = calloc(sizeof(double), type->items);
    this->total = type->total;
    this->caption = strdup(type->caption);
-   ((Object*)this)->delete = Meter_delete;
-   ((Object*)this)->class = METER_CLASS;
-   ((Object*)this)->display = type->display;
    Meter_setMode(this, type->mode);
    if (this->type->init)
       this->type->init(this);
diff --git a/Meter.h b/Meter.h
index c8cb703d..e564d3c3 100644
--- a/Meter.h
+++ b/Meter.h
@@ -96,6 +96,7 @@ typedef enum {
 #include "TasksMeter.h"
 #include "LoadAverageMeter.h"
 #include "UptimeMeter.h"
+#include "ClockMeter.h"
 
 #ifndef MIN
 #define MIN(a,b) ((a)<(b)?(a):(b))
@@ -104,7 +105,11 @@ typedef enum {
 #define MAX(a,b) ((a)>(b)?(a):(b))
 #endif
 
+#ifdef DEBUG
 extern char* METER_CLASS;
+#else
+#define METER_CLASS NULL
+#endif
 
 extern MeterType* Meter_types[];
 
diff --git a/Object.c b/Object.c
index 62a1c3a3..15b9a6ec 100644
--- a/Object.c
+++ b/Object.c
@@ -15,37 +15,37 @@ in the source distribution for its full text.
 #include "debug.h"
 
 /*{
+
+#ifndef DEBUG
+#define Object_setClass(obj, class)
+#endif
+
 typedef struct Object_ Object;
 
 typedef void(*Object_Display)(Object*, RichString*);
-typedef int(*Object_Compare)(const Object*, const Object*);
+typedef int(*Object_Compare)(const void*, const void*);
 typedef void(*Object_Delete)(Object*);
 
 struct Object_ {
+   #ifdef DEBUG
    char* class;
+   #endif
    Object_Display display;
-   Object_Compare compare;
    Object_Delete delete;
 };
 }*/
 
-static char* OBJECT_CLASS = "Object";
+#ifdef DEBUG
+char* OBJECT_CLASS = "Object";
 
-void Object_new() {
-   Object* this;
-   this = malloc(sizeof(Object));
-   this->class = OBJECT_CLASS;
-   this->display = Object_display;
-   this->compare = Object_compare;
-   this->delete = Object_delete;
-}
+#else
+#define OBJECT_CLASS NULL
+#endif
 
-bool Object_instanceOf(Object* this, char* class) {
-   return this->class == class;
-}
+#ifdef DEBUG
 
-void Object_delete(Object* this) {
-   free(this);
+void Object_setClass(void* this, char* class) {
+   ((Object*)this)->class = class;
 }
 
 void Object_display(Object* this, RichString* out) {
@@ -54,6 +54,4 @@ void Object_display(Object* this, RichString* out) {
    RichString_write(out, CRT_colors[DEFAULT_COLOR], objAddress);
 }
 
-int Object_compare(const Object* this, const Object* o) {
-   return (this - o);
-}
+#endif
diff --git a/Object.h b/Object.h
index b4c3dffb..f8a8c6d2 100644
--- a/Object.h
+++ b/Object.h
@@ -17,27 +17,38 @@ in the source distribution for its full text.
 
 #include "debug.h"
 
+
+#ifndef DEBUG
+#define Object_setClass(obj, class)
+#endif
+
 typedef struct Object_ Object;
 
 typedef void(*Object_Display)(Object*, RichString*);
-typedef int(*Object_Compare)(const Object*, const Object*);
+typedef int(*Object_Compare)(const void*, const void*);
 typedef void(*Object_Delete)(Object*);
 
 struct Object_ {
+   #ifdef DEBUG
    char* class;
+   #endif
    Object_Display display;
-   Object_Compare compare;
    Object_Delete delete;
 };
 
-void Object_new();
+#ifdef DEBUG
+extern char* OBJECT_CLASS;
 
-bool Object_instanceOf(Object* this, char* class);
+#else
+#define OBJECT_CLASS NULL
+#endif
 
-void Object_delete(Object* this);
+#ifdef DEBUG
+
+void Object_setClass(void* this, char* class);
 
 void Object_display(Object* this, RichString* out);
 
-int Object_compare(const Object* this, const Object* o);
+#endif
 
 #endif
diff --git a/Panel.c b/Panel.c
index 081306cf..fef7018b 100644
--- a/Panel.c
+++ b/Panel.c
@@ -10,6 +10,7 @@ in the source distribution for its full text.
 #include "Vector.h"
 #include "CRT.h"
 #include "RichString.h"
+#include "ListItem.h"
 
 #include <math.h>
 #include <stdbool.h>
@@ -54,12 +55,18 @@ struct Panel_ {
 #define MAX(a,b) ((a)>(b)?(a):(b))
 #endif
 
+#ifdef DEBUG
 char* PANEL_CLASS = "Panel";
+#else
+#define PANEL_CLASS NULL
+#endif
 
-Panel* Panel_new(int x, int y, int w, int h, char* type, bool owner) {
+
+Panel* Panel_new(int x, int y, int w, int h, char* type, bool owner, Object_Compare compare) {
    Panel* this;
    this = malloc(sizeof(Panel));
    Panel_init(this, x, y, w, h, type, owner);
+   this->items->compare = compare;
    return this;
 }
 
@@ -71,14 +78,14 @@ void Panel_delete(Object* cast) {
 
 void Panel_init(Panel* this, int x, int y, int w, int h, char* type, bool owner) {
    Object* super = (Object*) this;
-   super->class = PANEL_CLASS;
+   Object_setClass(this, PANEL_CLASS);
    super->delete = Panel_delete;
    this->x = x;
    this->y = y;
    this->w = w;
    this->h = h;
    this->eventHandler = NULL;
-   this->items = Vector_new(type, owner, DEFAULT_SIZE);
+   this->items = Vector_new(type, owner, DEFAULT_SIZE, ListItem_compare);
    this->scrollV = 0;
    this->scrollH = 0;
    this->selected = 0;
diff --git a/Panel.h b/Panel.h
index 4b96fe48..eda9c85d 100644
--- a/Panel.h
+++ b/Panel.h
@@ -55,9 +55,14 @@ struct Panel_ {
 #define MAX(a,b) ((a)>(b)?(a):(b))
 #endif
 
+#ifdef DEBUG
 extern char* PANEL_CLASS;
+#else
+#define PANEL_CLASS NULL
+#endif
 
-Panel* Panel_new(int x, int y, int w, int h, char* type, bool owner);
+
+Panel* Panel_new(int x, int y, int w, int h, char* type, bool owner, Object_Compare compare);
 
 void Panel_delete(Object* cast);
 
diff --git a/Process.c b/Process.c
index a97d5d13..7707a1a1 100644
--- a/Process.c
+++ b/Process.c
@@ -62,16 +62,19 @@ typedef struct Process_ {
    int tty_nr;
    int tpgid;
    unsigned long int flags;
+   #ifdef DEBUG
    unsigned long int minflt;
    unsigned long int cminflt;
    unsigned long int majflt;
    unsigned long int cmajflt;
+   #endif
    unsigned long int utime;
    unsigned long int stime;
    long int cutime;
    long int cstime;
    long int priority;
    long int nice;
+   #ifdef DEBUG
    long int itrealvalue;
    unsigned long int starttime;
    unsigned long int vsize;
@@ -89,6 +92,7 @@ typedef struct Process_ {
    unsigned long int wchan;
    unsigned long int nswap;
    unsigned long int cnswap;
+   #endif
    int exit_signal;
    int processor;
    int m_size;
@@ -106,7 +110,11 @@ typedef struct Process_ {
 
 }*/
 
+#ifdef DEBUG
 char* PROCESS_CLASS = "Process";
+#else
+#define PROCESS_CLASS NULL
+#endif
 
 char *Process_fieldNames[] = {
    "", "PID", "Command", "STATE", "PPID", "PGRP", "SESSION", "TTY_NR", "TPGID", "FLAGS", "MINFLT", "CMINFLT", "MAJFLT", "CMAJFLT", "UTIME", "STIME", "CUTIME", "CSTIME", "PRIORITY", "NICE", "ITREALVALUE", "STARTTIME", "VSIZE", "RSS", "RLIM", "STARTCODE", "ENDCODE", "STARTSTACK", "KSTKESP", "KSTKEIP", "SIGNAL", "BLOCKED", "SIGIGNORE", "SIGCATCH", "WCHAN", "NSWAP", "CNSWAP", "EXIT_SIGNAL",  "PROCESSOR", "M_SIZE", "M_RESIDENT", "M_SHARE", "M_TRS", "M_DRS", "M_LRS", "M_DT", "ST_UID", "PERCENT_CPU", "PERCENT_MEM", "USER", "TIME", "*** report bug! ***"
@@ -114,9 +122,8 @@ char *Process_fieldNames[] = {
 
 Process* Process_new(struct ProcessList_ *pl) {
    Process* this = malloc(sizeof(Process));
-   ((Object*)this)->class = PROCESS_CLASS;
+   Object_setClass(this, PROCESS_CLASS);
    ((Object*)this)->display = Process_display;
-   ((Object*)this)->compare = Process_compare;
    ((Object*)this)->delete = Process_delete;
    this->pl = pl;
    this->tag = false;
@@ -265,21 +272,21 @@ void Process_writeField(Process* this, RichString* str, ProcessField field) {
          for (int i = 0; i < 32; i++)
             if (this->indent & (1 << i))
                maxIndent = i+1;
-	 for (int i = 0; i < maxIndent - 1; i++) {
+          for (int i = 0; i < maxIndent - 1; i++) {
             if (this->indent & (1 << i))
                snprintf(buf, n, " |  ");
             else
                snprintf(buf, n, "    ");
             buf += 4;
             n -= 4;
-	 }
+         }
          if (this->pl->direction == 1)
             snprintf(buf, n, " `- ");
          else
             snprintf(buf, n, " ,- ");
          RichString_append(str, CRT_colors[PROCESS_TREE], buffer);
          Process_writeCommand(this, attr, str);
-	 return;
+         return;
       }
    }
    case STATE: {
@@ -345,44 +352,57 @@ void Process_writeField(Process* this, RichString* str, ProcessField field) {
    return;
 }
 
-int Process_compare(const Object* v1, const Object* v2) {
+int Process_pidCompare(const void* v1, const void* v2) {
    Process* p1 = (Process*)v1;
    Process* p2 = (Process*)v2;
-   int direction = p1->pl->direction;
-   switch (p1->pl->sortKey) {
-   case PID:
-      return (p2->pid - p1->pid) * direction;
-   case PPID:
-      return (p2->ppid - p1->ppid) * direction;
-   case USER:
-      return strcmp(p2->user, p1->user) * direction;
-   case PRIORITY:
-      return (p2->priority - p1->priority) * direction;
-   case STATE:
-      return (p2->state - p1->state) * direction;
-   case NICE:
-      return (p2->nice - p1->nice) * direction;
-   case M_SIZE:
-      return (p1->m_size - p2->m_size) * direction;
-   case M_RESIDENT:
-      return (p1->m_resident - p2->m_resident) * direction;
-   case M_SHARE:
-      return (p1->m_share - p2->m_share) * direction;
-   case PERCENT_CPU:
-      return (p1->percent_cpu < p2->percent_cpu ? -1 : 1) * direction;
-   case PERCENT_MEM:
-      return (p1->percent_mem < p2->percent_mem ? -1 : 1) * direction;
-   case UTIME:
-      return (p1->utime - p2->utime) * direction;
-   case STIME:
-      return (p1->stime - p2->stime) * direction;
-   case TIME:
-      return ((p1->utime+p1->stime) - (p2->utime+p2->stime)) * direction;
-   case COMM:
-      return strcmp(p2->comm, p1->comm) * direction;
-   default:
-      return (p2->pid - p1->pid) * direction;
+   return (p1->pid - p2->pid);
+}
+
+int Process_compare(const void* v1, const void* v2) {
+   Process *p1, *p2;
+   ProcessList *pl = ((Process*)v1)->pl;
+   if (pl->direction == 1) {
+      p1 = (Process*)v1;
+      p2 = (Process*)v2;
+   } else {
+      p2 = (Process*)v1;
+      p1 = (Process*)v2;
    }
+   switch (pl->sortKey) {
+   case PID:
+      return (p1->pid - p2->pid);
+   case PPID:
+      return (p1->ppid - p2->ppid);
+   case USER:
+      return strcmp(p1->user, p2->user);
+   case PRIORITY:
+      return (p1->priority - p2->priority);
+   case STATE:
+      return (p1->state - p2->state);
+   case NICE:
+      return (p1->nice - p2->nice);
+   case M_SIZE:
+      return (p2->m_size - p1->m_size);
+   case M_RESIDENT:
+      return (p2->m_resident - p1->m_resident);
+   case M_SHARE:
+      return (p2->m_share - p1->m_share);
+   case PERCENT_CPU:
+      return (p2->percent_cpu > p1->percent_cpu ? 1 : -1);
+   case PERCENT_MEM:
+      return (p2->m_resident - p1->m_resident);
+   case UTIME:
+      return (p2->utime - p1->utime);
+   case STIME:
+      return (p2->stime - p1->stime);
+   case TIME:
+      return ((p2->utime+p2->stime) - (p1->utime+p1->stime));
+   case COMM:
+      return strcmp(p1->comm, p2->comm);
+   default:
+      return (p1->pid - p2->pid);
+   }
+
 }
 
 char* Process_printField(ProcessField field) {
diff --git a/Process.h b/Process.h
index 51b11d9a..680b0d4a 100644
--- a/Process.h
+++ b/Process.h
@@ -64,16 +64,19 @@ typedef struct Process_ {
    int tty_nr;
    int tpgid;
    unsigned long int flags;
+   #ifdef DEBUG
    unsigned long int minflt;
    unsigned long int cminflt;
    unsigned long int majflt;
    unsigned long int cmajflt;
+   #endif
    unsigned long int utime;
    unsigned long int stime;
    long int cutime;
    long int cstime;
    long int priority;
    long int nice;
+   #ifdef DEBUG
    long int itrealvalue;
    unsigned long int starttime;
    unsigned long int vsize;
@@ -91,6 +94,7 @@ typedef struct Process_ {
    unsigned long int wchan;
    unsigned long int nswap;
    unsigned long int cnswap;
+   #endif
    int exit_signal;
    int processor;
    int m_size;
@@ -107,7 +111,11 @@ typedef struct Process_ {
 } Process;
 
 
+#ifdef DEBUG
 extern char* PROCESS_CLASS;
+#else
+#define PROCESS_CLASS NULL
+#endif
 
 extern char *Process_fieldNames[];
 
@@ -131,7 +139,9 @@ void Process_sendSignal(Process* this, int signal);
 
 void Process_writeField(Process* this, RichString* str, ProcessField field);
 
-int Process_compare(const Object* v1, const Object* v2);
+int Process_pidCompare(const void* v1, const void* v2);
+
+int Process_compare(const void* v1, const void* v2);
 
 char* Process_printField(ProcessField field);
 
diff --git a/ProcessList.c b/ProcessList.c
index fb7f8e9d..d6984568 100644
--- a/ProcessList.c
+++ b/ProcessList.c
@@ -15,6 +15,7 @@ in the source distribution for its full text.
 #include "Vector.h"
 #include "UsersTable.h"
 #include "Hashtable.h"
+#include "String.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -48,13 +49,17 @@ in the source distribution for its full text.
 #endif
 
 #ifndef MAX_READ
-#define MAX_READ 8192
+#define MAX_READ 2048
 #endif
 
 }*/
 
 /*{
 
+#ifdef DEBUG
+typedef int(*vxscanf)(void*, const char*, va_list);
+#endif
+
 typedef struct ProcessList_ {
    Vector* processes;
    Vector* processes2;
@@ -108,8 +113,6 @@ static ProcessField defaultHeaders[] = { PID, USER, PRIORITY, NICE, M_SIZE, M_RE
 
 #ifdef DEBUG
 
-typedef int(*vxscanf)(void*, const char*, va_list);
-
 #define ProcessList_read(this, buffer, format, ...) ProcessList_xread(this, (vxscanf) vsscanf, buffer, format, ## __VA_ARGS__ )
 #define ProcessList_fread(this, file, format, ...)  ProcessList_xread(this, (vxscanf) vfscanf, file, format, ## __VA_ARGS__ )
 
@@ -173,13 +176,13 @@ static inline int ProcessList_xread(ProcessList* this, vxscanf fn, void* buffer,
 ProcessList* ProcessList_new(UsersTable* usersTable) {
    ProcessList* this;
    this = malloc(sizeof(ProcessList));
-   this->processes = Vector_new(PROCESS_CLASS, true, DEFAULT_SIZE);
+   this->processes = Vector_new(PROCESS_CLASS, true, DEFAULT_SIZE, Process_compare);
    this->processTable = Hashtable_new(20, false);
    this->prototype = Process_new(this);
    this->usersTable = usersTable;
    
    /* tree-view auxiliary buffers */
-   this->processes2 = Vector_new(PROCESS_CLASS, true, DEFAULT_SIZE);
+   this->processes2 = Vector_new(PROCESS_CLASS, true, DEFAULT_SIZE, Process_compare);
    
    #ifdef DEBUG
    this->traceFile = fopen("/tmp/htop-proc-trace", "w");
@@ -286,11 +289,8 @@ void ProcessList_add(ProcessList* this, Process* p) {
 
 void ProcessList_remove(ProcessList* this, Process* p) {
    Hashtable_remove(this->processTable, p->pid);
-   ProcessField pf = this->sortKey;
-   this->sortKey = PID;
-   int index = Vector_indexOf(this->processes, p);
+   int index = Vector_indexOf(this->processes, p, Process_pidCompare);
    Vector_remove(this->processes, index);
-   this->sortKey = pf;
 }
 
 Process* ProcessList_get(ProcessList* this, int index) {
@@ -302,7 +302,7 @@ int ProcessList_size(ProcessList* this) {
 }
 
 static void ProcessList_buildTree(ProcessList* this, int pid, int level, int indent, int direction) {
-   Vector* children = Vector_new(PROCESS_CLASS, false, DEFAULT_SIZE);
+   Vector* children = Vector_new(PROCESS_CLASS, false, DEFAULT_SIZE, Process_compare);
 
    for (int i = 0; i < Vector_size(this->processes); i++) {
       Process* process = (Process*) (Vector_get(this->processes, i));
@@ -352,7 +352,7 @@ void ProcessList_sort(ProcessList* this) {
 
 static int ProcessList_readStatFile(ProcessList* this, Process *proc, FILE *f, char *command) {
    static char buf[MAX_READ];
-   long int zero;
+   unsigned long int zero;
 
    int size = fread(buf, 1, MAX_READ, f);
    if(!size) return 0;
@@ -370,6 +370,7 @@ static int ProcessList_readStatFile(ProcessList* this, Process *proc, FILE *f, c
    command[commsize] = '\0';
    location = end + 2;
    
+   #ifdef DEBUG
    int num = ProcessList_read(this, location, 
       "%c %d %d %d %d %d %lu %lu %lu %lu "
       "%lu %lu %lu %ld %ld %ld %ld %ld %ld "
@@ -377,14 +378,34 @@ static int ProcessList_readStatFile(ProcessList* this, Process *proc, FILE *f, c
       "%lu %lu %lu %lu %lu %lu %lu %lu "
       "%d %d",
       &proc->state, &proc->ppid, &proc->pgrp, &proc->session, &proc->tty_nr, 
-      &proc->tpgid, &proc->flags, &proc->minflt, &proc->cminflt, &proc->majflt, 
-      &proc->cmajflt, &proc->utime, &proc->stime, &proc->cutime, &proc->cstime, 
+      &proc->tpgid, &proc->flags,
+      &proc->minflt, &proc->cminflt, &proc->majflt, &proc->cmajflt,
+      &proc->utime, &proc->stime, &proc->cutime, &proc->cstime, 
       &proc->priority, &proc->nice, &zero, &proc->itrealvalue, 
       &proc->starttime, &proc->vsize, &proc->rss, &proc->rlim, 
       &proc->startcode, &proc->endcode, &proc->startstack, &proc->kstkesp, 
       &proc->kstkeip, &proc->signal, &proc->blocked, &proc->sigignore, 
       &proc->sigcatch, &proc->wchan, &proc->nswap, &proc->cnswap, 
       &proc->exit_signal, &proc->processor);
+   #else
+   long int uzero;
+   int num = ProcessList_read(this, location, 
+      "%c %d %d %d %d %d %lu %lu %lu %lu "
+      "%lu %lu %lu %ld %ld %ld %ld %ld %ld "
+      "%lu %lu %ld %lu %lu %lu %lu %lu "
+      "%lu %lu %lu %lu %lu %lu %lu %lu "
+      "%d %d",
+      &proc->state, &proc->ppid, &proc->pgrp, &proc->session, &proc->tty_nr, 
+      &proc->tpgid, &proc->flags,
+      &zero, &zero, &zero, &zero,
+      &proc->utime, &proc->stime, &proc->cutime, &proc->cstime, 
+      &proc->priority, &proc->nice, &uzero, &uzero, 
+      &zero, &zero, &uzero, &zero, 
+      &zero, &zero, &zero, &zero, 
+      &zero, &zero, &zero, &zero, 
+      &zero, &zero, &zero, &zero, 
+      &proc->exit_signal, &proc->processor);
+   #endif
    
    // This assert is always valid on 2.4, but reportedly not always valid on 2.6.
    // TODO: Check if the semantics of this field has changed.
@@ -397,14 +418,15 @@ static int ProcessList_readStatFile(ProcessList* this, Process *proc, FILE *f, c
 bool ProcessList_readStatusFile(ProcessList* this, Process* proc, char* dirname, char* name) {
    char statusfilename[MAX_NAME+1];
    statusfilename[MAX_NAME] = '\0';
+   /*
+   bool success = false;
+   char buffer[256];
+   buffer[255] = '\0';
    snprintf(statusfilename, MAX_NAME, "%s/%s/status", dirname, name);
    FILE* status = ProcessList_fopen(this, statusfilename, "r");
-   bool success = false;
    if (status) {
-      char buffer[1024];
-      buffer[1023] = '\0';
       while (!feof(status)) {
-         char* ok = fgets(buffer, 1023, status);
+         char* ok = fgets(buffer, 255, status);
          if (!ok)
             break;
          if (String_startsWith(buffer, "Uid:")) {
@@ -421,14 +443,18 @@ bool ProcessList_readStatusFile(ProcessList* this, Process* proc, char* dirname,
       fclose(status);
    }
    if (!success) {
-      snprintf(statusfilename, MAX_NAME, "%s/%s/stat", dirname, name);
+   */
+      snprintf(statusfilename, MAX_NAME, "%s/%s", dirname, name);
       struct stat sstat;
       int statok = stat(statusfilename, &sstat);
       if (statok == -1)
          return false;
       proc->st_uid = sstat.st_uid;
-   }
-   return success;
+      return true;
+   /*
+   } else
+      return true;
+   */
 }
 
 void ProcessList_processEntries(ProcessList* this, char* dirname, int parent, float period) {
@@ -469,25 +495,25 @@ void ProcessList_processEntries(ProcessList* this, char* dirname, int parent, fl
          char command[PROCESS_COMM_LEN + 1];
 
          Process* process;
+
          Process* existingProcess = (Process*) Hashtable_get(this->processTable, pid);
-         if (!existingProcess) {
-            process = Process_clone(prototype);
+         if (existingProcess) {
+            process = existingProcess;
+         } else {
+            process = prototype;
+            process->comm = NULL;
             process->pid = pid;
-            ProcessList_add(this, process);
             if (! ProcessList_readStatusFile(this, process, dirname, name))
                goto errorReadingProcess;
-         } else {
-            process = existingProcess;
+            char* username = UsersTable_getRef(this->usersTable, process->st_uid);
+            if (username) {
+               strncpy(process->user, username, PROCESS_USER_LEN);
+            } else {
+               snprintf(process->user, PROCESS_USER_LEN, "%d", process->st_uid);
+            }
          }
          process->updated = true;
 
-         char* username = UsersTable_getRef(this->usersTable, process->st_uid);
-         if (username) {
-            strncpy(process->user, username, PROCESS_USER_LEN);
-         } else {
-            snprintf(process->user, PROCESS_USER_LEN, "%d", process->st_uid);
-         }
-
          int lasttimes = (process->utime + process->stime);
 
          snprintf(statusfilename, MAX_NAME, "%s/%s/stat", dirname, name);
@@ -498,13 +524,30 @@ void ProcessList_processEntries(ProcessList* this, char* dirname, int parent, fl
 
          int success = ProcessList_readStatFile(this, process, status, command);
          fclose(status);
-         if(!success) {
+         if(!success)
             goto errorReadingProcess;
-         }
 
          process->percent_cpu = (process->utime + process->stime - lasttimes) / 
             period * 100.0;
 
+         snprintf(statusfilename, MAX_NAME, "%s/%s/statm", dirname, name);
+         status = ProcessList_fopen(this, statusfilename, "r");
+
+         if(!status) {
+            goto errorReadingProcess;
+         }
+         int num = ProcessList_fread(this, status, "%d %d %d %d %d %d %d",
+             &process->m_size, &process->m_resident, &process->m_share, 
+             &process->m_trs, &process->m_drs, &process->m_lrs, 
+             &process->m_dt);
+
+         fclose(status);
+         if(num != 7)
+            goto errorReadingProcess;
+
+         if (this->hideKernelThreads && process->m_size == 0)
+            goto errorReadingProcess;
+
          if(!existingProcess) {
             snprintf(statusfilename, MAX_NAME, "%s/%s/cmdline", dirname, name);
             status = ProcessList_fopen(this, statusfilename, "r");
@@ -524,21 +567,6 @@ void ProcessList_processEntries(ProcessList* this, char* dirname, int parent, fl
             fclose(status);
          }
 
-         snprintf(statusfilename, MAX_NAME, "%s/%s/statm", dirname, name);
-         status = ProcessList_fopen(this, statusfilename, "r");
-
-         if(!status) {
-            goto errorReadingProcess;
-         }
-         int num = ProcessList_fread(this, status, "%d %d %d %d %d %d %d",
-             &process->m_size, &process->m_resident, &process->m_share, 
-             &process->m_trs, &process->m_drs, &process->m_lrs, 
-             &process->m_dt);
-
-         fclose(status);
-         if(num != 7)
-            goto errorReadingProcess;
-
          process->percent_mem = process->m_resident / 
             (float)(this->usedMem - this->cachedMem - this->buffersMem) * 
             100.0;
@@ -548,17 +576,25 @@ void ProcessList_processEntries(ProcessList* this, char* dirname, int parent, fl
             this->runningTasks++;
          }
 
-         if (this->hideKernelThreads && process->m_size == 0)
-            ProcessList_remove(this, process);
+         if (!existingProcess) {
+            process = Process_clone(process);
+            ProcessList_add(this, process);
+         }
 
          continue;
 
          // Exception handler.
          errorReadingProcess: {
-            ProcessList_remove(this, process);
+            if (existingProcess)
+               ProcessList_remove(this, process);
+            else {
+               if (process->comm)
+                  free(process->comm);
+            }
          }
       }
    }
+   prototype->comm = NULL;
    closedir(dir);
 }
 
diff --git a/ProcessList.h b/ProcessList.h
index 15fc2824..b38cefcd 100644
--- a/ProcessList.h
+++ b/ProcessList.h
@@ -18,6 +18,7 @@ in the source distribution for its full text.
 #include "Vector.h"
 #include "UsersTable.h"
 #include "Hashtable.h"
+#include "String.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -50,11 +51,15 @@ in the source distribution for its full text.
 #endif
 
 #ifndef MAX_READ
-#define MAX_READ 8192
+#define MAX_READ 2048
 #endif
 
 
 
+#ifdef DEBUG
+typedef int(*vxscanf)(void*, const char*, va_list);
+#endif
+
 typedef struct ProcessList_ {
    Vector* processes;
    Vector* processes2;
diff --git a/ScreenManager.c b/ScreenManager.c
index 7ec30ab2..8e88e28d 100644
--- a/ScreenManager.c
+++ b/ScreenManager.c
@@ -47,8 +47,8 @@ ScreenManager* ScreenManager_new(int x1, int y1, int x2, int y2, Orientation ori
    this->y2 = y2;
    this->fuBar = NULL;
    this->orientation = orientation;
-   this->items = Vector_new(PANEL_CLASS, owner, DEFAULT_SIZE);
-   this->fuBars = Vector_new(FUNCTIONBAR_CLASS, true, DEFAULT_SIZE);
+   this->items = Vector_new(PANEL_CLASS, owner, DEFAULT_SIZE, NULL);
+   this->fuBars = Vector_new(FUNCTIONBAR_CLASS, true, DEFAULT_SIZE, NULL);
    this->itemCount = 0;
    this->owner = owner;
    return this;
@@ -130,7 +130,7 @@ void ScreenManager_run(ScreenManager* this, Panel** lastFocus, int* lastKey) {
    if (this->fuBar)
       FunctionBar_draw(this->fuBar, NULL);
    
-   int ch;
+   int ch = 0;
    while (!quit) {
       int items = this->itemCount;
       for (int i = 0; i < items; i++) {
diff --git a/SignalItem.c b/SignalItem.c
index ae84fa86..81f564d2 100644
--- a/SignalItem.c
+++ b/SignalItem.c
@@ -25,11 +25,15 @@ typedef struct Signal_ {
 
 }*/
 
+#ifdef DEBUG
 char* SIGNAL_CLASS = "Signal";
+#else
+#define SIGNAL_CLASS NULL
+#endif
 
 Signal* Signal_new(char* name, int number) {
    Signal* this = malloc(sizeof(Signal));
-   ((Object*)this)->class = SIGNAL_CLASS;
+   Object_setClass(this, SIGNAL_CLASS);
    ((Object*)this)->display = Signal_display;
    ((Object*)this)->delete = Signal_delete;
    this->name = name;
diff --git a/SignalItem.h b/SignalItem.h
index 04828c0a..c60dfa40 100644
--- a/SignalItem.h
+++ b/SignalItem.h
@@ -26,7 +26,11 @@ typedef struct Signal_ {
 } Signal;
 
 
+#ifdef DEBUG
 extern char* SIGNAL_CLASS;
+#else
+#define SIGNAL_CLASS NULL
+#endif
 
 Signal* Signal_new(char* name, int number);
 
diff --git a/String.c b/String.c
index 00cd4f2c..e862bff5 100644
--- a/String.c
+++ b/String.c
@@ -14,6 +14,10 @@ in the source distribution for its full text.
 
 #include "debug.h"
 
+/*{
+#define String_startsWith(s, match) (strstr((s), (match)) == (s))
+}*/
+
 inline void String_delete(char* s) {
    free(s);
 }
@@ -102,10 +106,6 @@ inline int String_eq(char* s1, char* s2) {
    return (strcmp(s1, s2) == 0);
 }
 
-inline int String_startsWith(char* s, char* match) {
-   return (strstr(s, match) == s);
-}
-
 char** String_split(char* s, char sep) {
    const int rate = 10;
    char** out = (char**) malloc(sizeof(char*) * rate);
diff --git a/String.h b/String.h
index 8539f613..3a348c2a 100644
--- a/String.h
+++ b/String.h
@@ -17,6 +17,8 @@ in the source distribution for its full text.
 
 #include "debug.h"
 
+#define String_startsWith(s, match) (strstr((s), (match)) == (s))
+
 inline void String_delete(char* s);
 
 inline char* String_copy(char* orig);
@@ -39,8 +41,6 @@ void String_printPointer(void* p);
 
 inline int String_eq(char* s1, char* s2);
 
-inline int String_startsWith(char* s, char* match);
-
 char** String_split(char* s, char sep);
 
 void String_freeArray(char** s);
diff --git a/TraceScreen.c b/TraceScreen.c
index 001ef571..ff470c4f 100644
--- a/TraceScreen.c
+++ b/TraceScreen.c
@@ -41,7 +41,7 @@ static int tbEvents[3] = {KEY_F(4), KEY_F(5), 27};
 TraceScreen* TraceScreen_new(Process* process) {
    TraceScreen* this = (TraceScreen*) malloc(sizeof(TraceScreen));
    this->process = process;
-   this->display = Panel_new(0, 1, COLS, LINES-2, LISTITEM_CLASS, true);
+   this->display = Panel_new(0, 1, COLS, LINES-2, LISTITEM_CLASS, true, ListItem_compare);
    this->bar = FunctionBar_new(3, tbFunctions, tbKeys, tbEvents);
    this->tracing = true;
    return this;
diff --git a/Vector.c b/Vector.c
index 349dd127..4ad697cb 100644
--- a/Vector.c
+++ b/Vector.c
@@ -24,6 +24,7 @@ typedef void(*Vector_procedure)(void*);
 
 typedef struct Vector_ {
    Object **array;
+   Object_Compare compare;
    int arraySize;
    int growthRate;
    int items;
@@ -33,7 +34,7 @@ typedef struct Vector_ {
 
 }*/
 
-Vector* Vector_new(char* vectorType_, bool owner, int size) {
+Vector* Vector_new(char* vectorType_, bool owner, int size, Object_Compare compare) {
    Vector* this;
 
    if (size == DEFAULT_SIZE)
@@ -45,6 +46,7 @@ Vector* Vector_new(char* vectorType_, bool owner, int size) {
    this->items = 0;
    this->vectorType = vectorType_;
    this->owner = owner;
+   this->compare = compare;
    return this;
 }
 
@@ -58,6 +60,8 @@ void Vector_delete(Vector* this) {
    free(this);
 }
 
+#ifdef DEBUG
+
 static inline bool Vector_isConsistent(Vector* this) {
    if (this->owner) {
       for (int i = 0; i < this->items; i++)
@@ -69,6 +73,8 @@ static inline bool Vector_isConsistent(Vector* this) {
    }
 }
 
+#endif
+
 void Vector_prune(Vector* this) {
    assert(Vector_isConsistent(this));
    int i;
@@ -83,27 +89,18 @@ void Vector_prune(Vector* this) {
 }
 
 void Vector_sort(Vector* this) {
+   assert(this->compare);
    assert(Vector_isConsistent(this));
-   int i, j;
-   for (i = 1; i < this->items; i++) {
+   Object_Compare compare = this->compare;
+   /* Insertion sort works best on mostly-sorted arrays. */
+   for (int i = 1; i < this->items; i++) {
+      int j;
       void* t = this->array[i];
-      for (j = i-1; j >= 0 && this->array[j]->compare(this->array[j], t) < 0; j--)
+      for (j = i-1; j >= 0 && compare(this->array[j], t) > 0; j--)
          this->array[j+1] = this->array[j];
       this->array[j+1] = t;
    }
    assert(Vector_isConsistent(this));
-
-   /*
-   for (int i = 0; i < this->items; i++) {
-      for (int j = i+1; j < this->items; j++) {
-         if (this->array[j]->compare(this->array[j], t) < 0) {
-            void* tmp = this->array[i];
-            this->array[i] = this->array[j];
-            this->array[j] = tmp;
-         }
-      }
-   }
-   */
 }
 
 static void Vector_checkArraySize(Vector* this) {
@@ -230,16 +227,14 @@ void Vector_add(Vector* this, void* data_) {
    assert(Vector_isConsistent(this));
 }
 
-inline int Vector_indexOf(Vector* this, void* search_) {
+inline int Vector_indexOf(Vector* this, void* search_, Object_Compare compare) {
    assert(((Object*)search_)->class == this->vectorType);
+   assert(this->compare);
    Object* search = search_;
    assert(Vector_isConsistent(this));
-
-   int i;
-
-   for (i = 0; i < this->items; i++) {
+   for (int i = 0; i < this->items; i++) {
       Object* o = (Object*)this->array[i];
-      if (o && o->compare(o, search) == 0)
+      if (o && compare(search, o) == 0)
          return i;
    }
    return -1;
diff --git a/Vector.h b/Vector.h
index a01c8fa7..b332ae80 100644
--- a/Vector.h
+++ b/Vector.h
@@ -26,6 +26,7 @@ typedef void(*Vector_procedure)(void*);
 
 typedef struct Vector_ {
    Object **array;
+   Object_Compare compare;
    int arraySize;
    int growthRate;
    int items;
@@ -34,10 +35,14 @@ typedef struct Vector_ {
 } Vector;
 
 
-Vector* Vector_new(char* vectorType_, bool owner, int size);
+Vector* Vector_new(char* vectorType_, bool owner, int size, Object_Compare compare);
 
 void Vector_delete(Vector* this);
 
+#ifdef DEBUG
+
+#endif
+
 void Vector_prune(Vector* this);
 
 void Vector_sort(Vector* this);
@@ -62,7 +67,7 @@ void Vector_merge(Vector* this, Vector* v2);
 
 void Vector_add(Vector* this, void* data_);
 
-inline int Vector_indexOf(Vector* this, void* search_);
+inline int Vector_indexOf(Vector* this, void* search_, Object_Compare compare);
 
 void Vector_foreach(Vector* this, Vector_procedure f);
 
diff --git a/htop.c b/htop.c
index de3f14eb..7ffccaa2 100644
--- a/htop.c
+++ b/htop.c
@@ -245,7 +245,7 @@ int main(int argc, char** argv) {
    
    CRT_init(settings->delay, settings->colorScheme);
    
-   panel = Panel_new(0, headerHeight, COLS, LINES - headerHeight - 2, PROCESS_CLASS, false);
+   panel = Panel_new(0, headerHeight, COLS, LINES - headerHeight - 2, PROCESS_CLASS, false, NULL);
    Panel_setRichHeader(panel, ProcessList_printHeader(pl));
    
    char* searchFunctions[3] = {"Next  ", "Exit  ", " Search: "};
@@ -506,7 +506,7 @@ int main(int argc, char** argv) {
       }
       case 'u':
       {
-         Panel* usersPanel = Panel_new(0, 0, 0, 0, LISTITEM_CLASS, true);
+         Panel* usersPanel = Panel_new(0, 0, 0, 0, LISTITEM_CLASS, true, ListItem_compare);
          Panel_setHeader(usersPanel, "Show processes of:");
          UsersTable_foreach(ut, addUserToList, usersPanel);
          Vector_sort(usersPanel->items);
@@ -569,7 +569,7 @@ int main(int argc, char** argv) {
       case '.':
       case KEY_F(6):
       {
-         Panel* sortPanel = Panel_new(0,0,0,0,LISTITEM_CLASS,true);
+         Panel* sortPanel = Panel_new(0, 0, 0, 0, LISTITEM_CLASS, true, ListItem_compare);
          Panel_setHeader(sortPanel, "Sort by");
          char* fuFunctions[2] = {"Sort  ", "Cancel "};
          ProcessField* fields = pl->fields;