diff --git a/ClockMeter.c b/ClockMeter.c
index 410c7e8a..de47bdcb 100644
--- a/ClockMeter.c
+++ b/ClockMeter.c
@@ -20,9 +20,10 @@ static const int ClockMeter_attributes[] = {
 };
 
 static void ClockMeter_updateValues(Meter* this) {
-   time_t t = time(NULL);
+   const ProcessList* pl = this->pl;
+
    struct tm result;
-   const struct tm* lt = localtime_r(&t, &result);
+   const struct tm* lt = localtime_r(&pl->timestamp.tv_sec, &result);
    this->values[0] = lt->tm_hour * 60 + lt->tm_min;
    strftime(this->txtBuffer, sizeof(this->txtBuffer), "%H:%M:%S", lt);
 }
diff --git a/DateMeter.c b/DateMeter.c
index ac653b62..e7fe1a67 100644
--- a/DateMeter.c
+++ b/DateMeter.c
@@ -20,9 +20,10 @@ static const int DateMeter_attributes[] = {
 };
 
 static void DateMeter_updateValues(Meter* this) {
-   time_t t = time(NULL);
+   const ProcessList* pl = this->pl;
+
    struct tm result;
-   const struct tm* lt = localtime_r(&t, &result);
+   const struct tm* lt = localtime_r(&pl->timestamp.tv_sec, &result);
    this->values[0] = lt->tm_yday;
    int year = lt->tm_year + 1900;
    if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
diff --git a/DiskIOMeter.c b/DiskIOMeter.c
index dde007ed..c1b35690 100644
--- a/DiskIOMeter.c
+++ b/DiskIOMeter.c
@@ -31,12 +31,10 @@ static uint32_t cached_write_diff;
 static double cached_utilisation_diff;
 
 static void DiskIOMeter_updateValues(Meter* this) {
-   static uint64_t cached_last_update;
+   const ProcessList* pl = this->pl;
 
-   struct timeval tv;
-   gettimeofday(&tv, NULL);
-   uint64_t timeInMilliSeconds = (uint64_t)tv.tv_sec * 1000 + (uint64_t)tv.tv_usec / 1000;
-   uint64_t passedTimeInMs = timeInMilliSeconds - cached_last_update;
+   static uint64_t cached_last_update;
+   uint64_t passedTimeInMs = pl->timestampMs - cached_last_update;
 
    /* update only every 500ms */
    if (passedTimeInMs > 500) {
@@ -45,7 +43,7 @@ static void DiskIOMeter_updateValues(Meter* this) {
       static uint64_t cached_msTimeSpend_total;
       uint64_t diff;
 
-      cached_last_update = timeInMilliSeconds;
+      cached_last_update = pl->timestampMs;
 
       DiskIOData data;
 
diff --git a/Meter.c b/Meter.c
index 6aa9f08e..b60b6933 100644
--- a/Meter.c
+++ b/Meter.c
@@ -18,6 +18,7 @@ in the source distribution for its full text.
 #include "CRT.h"
 #include "Macros.h"
 #include "Object.h"
+#include "Platform.h"
 #include "ProvideCurses.h"
 #include "RichString.h"
 #include "Settings.h"
@@ -286,6 +287,7 @@ static const char* const GraphMeterMode_dotsAscii[] = {
 };
 
 static void GraphMeterMode_draw(Meter* this, int x, int y, int w) {
+   const ProcessList* pl = this->pl;
 
    if (!this->drawData) {
       this->drawData = xCalloc(1, sizeof(GraphData));
@@ -312,12 +314,10 @@ static void GraphMeterMode_draw(Meter* this, int x, int y, int w) {
    x += captionLen;
    w -= captionLen;
 
-   struct timeval now;
-   gettimeofday(&now, NULL);
-   if (!timercmp(&now, &(data->time), <)) {
+   if (!timercmp(&pl->timestamp, &(data->time), <)) {
       int globalDelay = this->pl->settings->delay;
       struct timeval delay = { .tv_sec = globalDelay / 10, .tv_usec = (globalDelay - ((globalDelay / 10) * 10)) * 100000 };
-      timeradd(&now, &delay, &(data->time));
+      timeradd(&pl->timestamp, &delay, &(data->time));
 
       for (int i = 0; i < nValues - 1; i++)
          data->values[i] = data->values[i + 1];
diff --git a/NetworkIOMeter.c b/NetworkIOMeter.c
index c0e1b06f..bfcb3c0e 100644
--- a/NetworkIOMeter.c
+++ b/NetworkIOMeter.c
@@ -25,12 +25,10 @@ static uint32_t cached_txb_diff;
 static uint32_t cached_txp_diff;
 
 static void NetworkIOMeter_updateValues(Meter* this) {
+   const ProcessList* pl = this->pl;
    static uint64_t cached_last_update = 0;
 
-   struct timeval tv;
-   gettimeofday(&tv, NULL);
-   uint64_t timeInMilliSeconds = (uint64_t)tv.tv_sec * 1000 + (uint64_t)tv.tv_usec / 1000;
-   uint64_t passedTimeInMs = timeInMilliSeconds - cached_last_update;
+   uint64_t passedTimeInMs = pl->timestampMs - cached_last_update;
 
    /* update only every 500ms */
    if (passedTimeInMs > 500) {
@@ -40,7 +38,7 @@ static void NetworkIOMeter_updateValues(Meter* this) {
       static uint64_t cached_txp_total;
       uint64_t diff;
 
-      cached_last_update = timeInMilliSeconds;
+      cached_last_update = pl->timestampMs;
 
       NetworkIOData data;
       hasData = Platform_getNetworkIO(&data);
diff --git a/ProcessList.h b/ProcessList.h
index 3d9b8ff2..46944dbd 100644
--- a/ProcessList.h
+++ b/ProcessList.h
@@ -48,6 +48,9 @@ typedef struct ProcessList_ {
    Hashtable* displayTreeSet;
    Hashtable* draftingTreeSet;
 
+   struct timeval timestamp;  /* time of the current sample */
+   uint64_t timestampMs;      /* current time in milliseconds */
+
    Panel* panel;
    int following;
    uid_t userId;
diff --git a/linux/LinuxProcessList.c b/linux/LinuxProcessList.c
index b12a415b..c6fd205a 100644
--- a/linux/LinuxProcessList.c
+++ b/linux/LinuxProcessList.c
@@ -189,6 +189,13 @@ static void LinuxProcessList_updateCPUcount(ProcessList* super, FILE* stream) {
    }
 }
 
+static void LinuxProcessList_updateTime(LinuxProcessList* this) {
+   ProcessList* pl = &(this->super);
+
+   gettimeofday(&pl->timestamp, NULL);
+   pl->timestampMs = (uint64_t)&pl->timestamp.tv_sec * 1000 + (uint64_t)pl->timestamp.tv_usec / 1000;
+}
+
 ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidMatchList, uid_t userId) {
    LinuxProcessList* this = xCalloc(1, sizeof(LinuxProcessList));
    ProcessList* pl = &(this->super);
@@ -1968,6 +1975,7 @@ void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
    LinuxProcessList* this = (LinuxProcessList*) super;
    const Settings* settings = super->settings;
 
+   LinuxProcessList_updateTime(this);
    LinuxProcessList_scanMemoryInfo(super);
    LinuxProcessList_scanHugePages(this);
    LinuxProcessList_scanZfsArcstats(this);
@@ -1989,10 +1997,6 @@ void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
       return;
    }
 
-   struct timeval tv;
-   gettimeofday(&tv, NULL);
-   unsigned long long now = tv.tv_sec * 1000ULL + tv.tv_usec / 1000ULL;
-
    /* PROCDIR is an absolute path */
    assert(PROCDIR[0] == '/');
 #ifdef HAVE_OPENAT
@@ -2001,5 +2005,5 @@ void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
    openat_arg_t rootFd = "";
 #endif
 
-   LinuxProcessList_recurseProcTree(this, rootFd, PROCDIR, NULL, period, now);
+   LinuxProcessList_recurseProcTree(this, rootFd, PROCDIR, NULL, period, super->timestampMs);
 }