diff --git a/ProcessList.c b/ProcessList.c
index 37c40bcf..cd8ebd8a 100644
--- a/ProcessList.c
+++ b/ProcessList.c
@@ -311,6 +311,11 @@ static void ProcessList_updateTreeSet(ProcessList* this) {
 }
 
 static void ProcessList_buildTreeBranch(ProcessList* this, pid_t pid, int level, int indent, int direction, bool show, int* node_counter, int* node_index) {
+   // On OpenBSD the kernel thread 'swapper' has pid 0.
+   // Do not treat it as root of any tree.
+   if (pid == 0)
+      return;
+
    Vector* children = Vector_new(Class(Process), false, DEFAULT_SIZE);
 
    for (int i = Vector_size(this->processes) - 1; i >= 0; i--) {
diff --git a/ProcessList.h b/ProcessList.h
index bfbe0ab3..3d9b8ff2 100644
--- a/ProcessList.h
+++ b/ProcessList.h
@@ -115,4 +115,8 @@ Process* ProcessList_getProcess(ProcessList* this, pid_t pid, bool* preExisting,
 
 void ProcessList_scan(ProcessList* this, bool pauseProcessUpdate);
 
+static inline Process* ProcessList_findProcess(ProcessList* this, pid_t pid) {
+   return (Process*) Hashtable_get(this->processTable, pid);
+}
+
 #endif
diff --git a/openbsd/OpenBSDProcess.h b/openbsd/OpenBSDProcess.h
index 6aab29a0..79f9b0fe 100644
--- a/openbsd/OpenBSDProcess.h
+++ b/openbsd/OpenBSDProcess.h
@@ -17,11 +17,18 @@ in the source distribution for its full text.
 
 typedef struct OpenBSDProcess_ {
    Process super;
+
+   /* 'Kernel virtual addr of u-area' to detect main threads */
+   uint64_t addr;
 } OpenBSDProcess;
 
-#define Process_isKernelThread(_process) (_process->pgrp == 0)
+static inline bool Process_isKernelThread(const Process* this) {
+   return this->pgrp == 0;
+}
 
-#define Process_isUserlandThread(_process) (_process->pid != _process->tgid)
+static inline bool Process_isUserlandThread(const Process* this) {
+   return this->pid != this->tgid;
+}
 
 extern const ProcessClass OpenBSDProcess_class;
 
diff --git a/openbsd/OpenBSDProcessList.c b/openbsd/OpenBSDProcessList.c
index 0a0c0a5f..122b55d3 100644
--- a/openbsd/OpenBSDProcessList.c
+++ b/openbsd/OpenBSDProcessList.c
@@ -74,6 +74,8 @@ ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidMatchList, ui
       CRT_fatalError("kvm_openfiles() failed");
    }
 
+   opl->cpuSpeed = -1;
+
    return pl;
 }
 
@@ -192,18 +194,29 @@ static double getpcpu(const struct kinfo_proc* kp) {
 
 static void OpenBSDProcessList_scanProcs(OpenBSDProcessList* this) {
    const Settings* settings = this->super.settings;
-   bool hideKernelThreads = settings->hideKernelThreads;
-   bool hideUserlandThreads = settings->hideUserlandThreads;
+   const bool hideKernelThreads = settings->hideKernelThreads;
+   const bool hideUserlandThreads = settings->hideUserlandThreads;
    int count = 0;
 
-   const struct kinfo_proc* kprocs = kvm_getprocs(this->kd, KERN_PROC_KTHREAD, 0, sizeof(struct kinfo_proc), &count);
+   const struct kinfo_proc* kprocs = kvm_getprocs(this->kd, KERN_PROC_KTHREAD | KERN_PROC_SHOW_THREADS, 0, sizeof(struct kinfo_proc), &count);
 
    for (int i = 0; i < count; i++) {
       const struct kinfo_proc* kproc = &kprocs[i];
 
+      /* Ignore main threads */
+      if (kproc->p_tid != -1) {
+         Process* containingProcess = ProcessList_findProcess(&this->super, kproc->p_pid);
+         if (containingProcess) {
+            if (((OpenBSDProcess*)containingProcess)->addr == kproc->p_addr)
+               continue;
+
+            containingProcess->nlwp++;
+         }
+      }
+
       bool preExisting = false;
-      Process* proc = ProcessList_getProcess(&this->super, kproc->p_pid, &preExisting, OpenBSDProcess_new);
-      //OpenBSDProcess* fp = (OpenBSDProcess*) proc;
+      Process* proc = ProcessList_getProcess(&this->super, (kproc->p_tid == -1) ? kproc->p_pid : kproc->p_tid, &preExisting, OpenBSDProcess_new);
+      OpenBSDProcess* fp = (OpenBSDProcess*) proc;
 
       proc->show = ! ((hideKernelThreads && Process_isKernelThread(proc)) || (hideUserlandThreads && Process_isUserlandThread(proc)));
 
@@ -227,33 +240,38 @@ static void OpenBSDProcessList_scanProcs(OpenBSDProcessList* this) {
          }
       }
 
+      fp->addr = kproc->p_addr;
       proc->m_virt = kproc->p_vm_dsize * pageSizeKB;
       proc->m_resident = kproc->p_vm_rssize * pageSizeKB;
-      proc->percent_mem = proc->m_resident / (double)(this->super.totalMem) * 100.0;
-      proc->percent_cpu = CLAMP(getpcpu(kproc), 0.0, this->super.cpuCount * 100.0);
-      //proc->nlwp = kproc->p_numthreads;
+      proc->percent_mem = proc->m_resident / (float)this->super.totalMem * 100.0F;
+      proc->percent_cpu = CLAMP(getpcpu(kproc), 0.0F, this->super.cpuCount * 100.0F);
       proc->nice = kproc->p_nice - 20;
       proc->time = 100 * (kproc->p_rtime_sec + ((kproc->p_rtime_usec + 500000) / 1000000));
       proc->priority = kproc->p_priority - PZERO;
+      proc->processor = kproc->p_cpuid;
+      proc->minflt = kproc->p_uru_minflt;
+      proc->majflt = kproc->p_uru_majflt;
+      proc->nlwp = 1;
 
       switch (kproc->p_stat) {
          case SIDL:    proc->state = 'I'; break;
-         case SRUN:    proc->state = 'R'; break;
+         case SRUN:    proc->state = 'P'; break;
          case SSLEEP:  proc->state = 'S'; break;
          case SSTOP:   proc->state = 'T'; break;
          case SZOMB:   proc->state = 'Z'; break;
          case SDEAD:   proc->state = 'D'; break;
-         case SONPROC: proc->state = 'P'; break;
+         case SONPROC: proc->state = 'R'; break;
          default:      proc->state = '?';
       }
 
       if (Process_isKernelThread(proc)) {
          this->super.kernelThreads++;
+      } else if (Process_isUserlandThread(proc)) {
+         this->super.userlandThreads++;
       }
 
       this->super.totalTasks++;
-      // SRUN ('R') means runnable, not running
-      if (proc->state == 'P') {
+      if (proc->state == 'R') {
          this->super.runningTasks++;
       }
       proc->updated = true;
@@ -333,6 +351,17 @@ static void OpenBSDProcessList_scanCPUTime(OpenBSDProcessList* this) {
    }
 
    kernelCPUTimesToHtop(avg, this->cpus);
+
+   {
+      const int mib[] = { CTL_HW, HW_CPUSPEED };
+      int cpuSpeed;
+      size_t size = sizeof(cpuSpeed);
+      if (sysctl(mib, 2, &cpuSpeed, &size, NULL, 0) == -1) {
+         this->cpuSpeed = -1;
+      } else {
+         this->cpuSpeed = cpuSpeed;
+      }
+   }
 }
 
 void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
diff --git a/openbsd/OpenBSDProcessList.h b/openbsd/OpenBSDProcessList.h
index a6195a52..46f53505 100644
--- a/openbsd/OpenBSDProcessList.h
+++ b/openbsd/OpenBSDProcessList.h
@@ -42,6 +42,7 @@ typedef struct OpenBSDProcessList_ {
    kvm_t* kd;
 
    CPUData* cpus;
+   int cpuSpeed;
 
 } OpenBSDProcessList;
 
diff --git a/openbsd/Platform.c b/openbsd/Platform.c
index fee4b71b..eea21411 100644
--- a/openbsd/Platform.c
+++ b/openbsd/Platform.c
@@ -15,6 +15,8 @@ in the source distribution for its full text.
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <sys/signal.h>  // needs to be included before <sys/proc.h> for 'struct sigaltstack'
+#include <sys/proc.h>
 #include <sys/resource.h>
 #include <sys/sensors.h>
 #include <sys/sysctl.h>
@@ -162,8 +164,7 @@ void Platform_getLoadAverage(double* one, double* five, double* fifteen) {
 }
 
 int Platform_getMaxPid() {
-   // this is hard-coded in sys/proc.h - no sysctl exists
-   return 99999;
+   return 2 * THREAD_PID_OFFSET;
 }
 
 double Platform_setCPUValues(Meter* this, unsigned int cpu) {
@@ -196,6 +197,8 @@ double Platform_setCPUValues(Meter* this, unsigned int cpu) {
 
    v[CPU_METER_TEMPERATURE] = NAN;
 
+   v[CPU_METER_FREQUENCY] = (pl->cpuSpeed != -1) ? pl->cpuSpeed : NAN;
+
    return totalPercent;
 }