diff --git a/src/include/internals.h b/src/include/internals.h
index 0c7079e6..f9dc9b63 100644
--- a/src/include/internals.h
+++ b/src/include/internals.h
@@ -258,7 +258,7 @@ struct _MSGQUEUE
     int loop_depth;             // message loop depth, for dialog boxes
 
     int idle_counter;           // the idle connter for MSG_IDLE
-    DWORD last_ticks_desktop;   // the last tick count for desktop timer
+    DWORD last_ticks;           // the last tick count saved; since 5.0.14
 
     /* Since 5.0.0, MiniGUI provides support for timers per message thread */
     int nr_timers;              // the number of active timers
diff --git a/src/include/timer.h b/src/include/timer.h
index 4978cc8b..f2f7a9ee 100644
--- a/src/include/timer.h
+++ b/src/include/timer.h
@@ -74,7 +74,7 @@ typedef struct _MSGQUEUE MSGQUEUE;
 extern "C" {
 #endif  /* __cplusplus */
 
-void __mg_update_tick_count (void* data);
+DWORD __mg_update_tick_count (MSGQUEUE* msg_queue);
 int  __mg_check_expired_timers (MSGQUEUE* msg_queue, DWORD inter);
 void __mg_remove_timers_by_msg_queue (MSGQUEUE* msg_queue);
 void __mg_remove_timer (MSGQUEUE* msg_queue, int slot);
diff --git a/src/kernel/desktop-ths.c b/src/kernel/desktop-ths.c
index 402714b7..b79d09ac 100644
--- a/src/kernel/desktop-ths.c
+++ b/src/kernel/desktop-ths.c
@@ -145,7 +145,7 @@ static IDLEHANDLER std_idle_handler;
 
 static BOOL idle_handler_for_desktop_thread (MSGQUEUE *msg_queue, BOOL wait)
 {
-    __mg_update_tick_count (NULL);
+    __mg_update_tick_count (msg_queue);
     return std_idle_handler (msg_queue, wait);
 }
 
diff --git a/src/kernel/timer.c b/src/kernel/timer.c
index ff895c90..93f49fe4 100644
--- a/src/kernel/timer.c
+++ b/src/kernel/timer.c
@@ -44,7 +44,7 @@
  *   <http://www.minigui.com/blog/minigui-licensing-policy/>.
  */
 /*
-** timer.c: The Timer module for MiniGUI-Threads.
+** timer.c: The Timer module for MiniGUI.
 **
 ** Current maintainer: Wei Yongming.
 **
@@ -79,139 +79,44 @@
 
 DWORD __mg_tick_counter = 0;
 
-/* update timer count for desktop thread */
-void __mg_update_tick_count (void *data)
+/* update timer count for message and desktop thread */
+DWORD __mg_update_tick_count (MSGQUEUE* msg_queue)
 {
+    DWORD ticks;
+
 #if defined(_MGRM_PROCESSES)
     if (mgIsServer) {
-        __mg_tick_counter = __mg_os_get_time_ticks ();
-        SHAREDRES_TIMER_COUNTER = __mg_tick_counter;
+        ticks = __mg_os_get_time_ticks ();
+        SHAREDRES_TIMER_COUNTER = ticks;
     }
     else {
-        __mg_tick_counter = SHAREDRES_TIMER_COUNTER;
+        ticks = SHAREDRES_TIMER_COUNTER;
     }
 #else   /* defined _MGRM_PROCESSES */
-    __mg_tick_counter = __mg_os_get_time_ticks ();
+    ticks = __mg_os_get_time_ticks ();
 #endif  /* not defined _MGRM_PROCESSES */
 
-    /* Since 5.0.0, the desktop only handles caret blinking in MSG_TIMEOUT
-       message, and the interval for the timer of desktop changes to 0.05s. */
-    if (__mg_tick_counter >
-            __mg_dsk_msg_queue->last_ticks_desktop + DESKTOP_TIMER_INERTVAL) {
-        __mg_dsk_msg_queue->dwState |= QS_DESKTIMER;
+    if (msg_queue && ticks != msg_queue->last_ticks) {
+        /* Since 5.0.0, the desktop only handles caret blinking in MSG_TIMEOUT
+           message, and the interval for the timer of desktop changes to 0.05s.
+         */
+        if (msg_queue == __mg_dsk_msg_queue) {
+            if (ticks > __mg_dsk_msg_queue->last_ticks +
+                    DESKTOP_TIMER_INERTVAL) {
+                __mg_dsk_msg_queue->dwState |= QS_DESKTIMER;
 #ifdef _MGRM_THREADS    /* only wake up desktop for threads mode */
-        POST_MSGQ (__mg_dsk_msg_queue);
+                POST_MSGQ (__mg_dsk_msg_queue);
 #endif
-        __mg_dsk_msg_queue->last_ticks_desktop = __mg_tick_counter;
+            }
+        }
+
+        msg_queue->last_ticks = ticks;
     }
 
-#if 0  /* deprecated code */
-#if defined(_MGRM_PROCESSES)
-    if (mgIsServer) {
-        DWORD elapsed_ticks;
-
-        /* Since 5.0.0, we use elapsed time in ms to count the ticks */
-        elapsed_ticks = __mg_os_get_elapsed_ms ();
-        elapsed_ticks = (elapsed_ticks + 5) / 10;
-
-        __mg_tick_counter += elapsed_ticks;
-        SHAREDRES_TIMER_COUNTER = __mg_tick_counter;
-    }
-    else {
-        __mg_tick_counter = SHAREDRES_TIMER_COUNTER;
-    }
-#else   /* defined _MGRM_PROCESSES */
-    DWORD elapsed_ticks;
-
-    /* Since 5.0.0, we use elapsed time in ms to count the ticks */
-    elapsed_ticks = __mg_os_get_elapsed_ms ();
-    elapsed_ticks = (elapsed_ticks + 5) / 10;
-    __mg_tick_counter += elapsed_ticks;
-#endif  /* not defined _MGRM_PROCESSES */
-
-    /* Since 5.0.0, the desktop only handles caret blinking in MSG_TIMEOUT
-       message, and the interval for the timer of desktop changes to 0.05s. */
-    if (__mg_tick_counter >
-            __mg_dsk_msg_queue->last_ticks_desktop + DESKTOP_TIMER_INERTVAL) {
-        __mg_dsk_msg_queue->dwState |= QS_DESKTIMER;
-#ifdef _MGRM_THREADS    /* only wake up desktop for threads mode */
-        POST_MSGQ (__mg_dsk_msg_queue);
-#endif
-        __mg_dsk_msg_queue->last_ticks_desktop = __mg_tick_counter;
-    }
-#endif  /* deprecated code */
+    __mg_tick_counter = ticks;
+    return ticks;
 }
 
-#ifdef __NOUNIX__
-
-static BOOL install_system_timer (void)
-{
-    return TRUE;
-}
-
-static BOOL unintall_system_timer (void)
-{
-    return TRUE;
-}
-
-#else   /* defined __NOUNIX__ */
-
-#include <signal.h>
-#include <unistd.h>
-#include <sys/time.h>
-
-static struct sigaction old_alarm_handler;
-static struct itimerval old_timer;
-
-static BOOL install_system_timer (void)
-{
-    struct itimerval timerv;
-    struct sigaction siga;
-
-    sigaction (SIGALRM, NULL, &old_alarm_handler);
-
-    siga = old_alarm_handler;
-    siga.sa_handler = (void(*)(int))__mg_update_tick_count;
-#ifndef _MGRM_STANDALONE
-    siga.sa_flags = 0;
-#else
-    siga.sa_flags = SA_RESTART;
-#endif
-    sigaction (SIGALRM, &siga, NULL);
-
-    timerv.it_interval.tv_sec = 0;
-#if defined(__uClinux__) && defined(_MGRM_STANDALONE)
-    timerv.it_interval.tv_usec = 100000;        /* 100 ms */
-#else
-    timerv.it_interval.tv_usec = 10000;         /* 10 ms */
-#endif
-    timerv.it_value = timerv.it_interval;
-
-    if (setitimer (ITIMER_REAL, &timerv, &old_timer) == -1) {
-        TIMER_ERR_SYS ("setitimer call failed!\n");
-        return FALSE;
-    }
-
-    return TRUE;
-}
-
-static BOOL unintall_system_timer (void)
-{
-    if (setitimer (ITIMER_REAL, &old_timer, 0) == -1) {
-        TIMER_ERR_SYS ("setitimer call failed!\n");
-        return FALSE;
-    }
-
-    if (sigaction (SIGALRM, &old_alarm_handler, NULL) == -1) {
-        TIMER_ERR_SYS ("sigaction call failed!\n");
-        return FALSE;
-    }
-
-    return TRUE;
-}
-
-#endif /* not defined __NOUNIX__ */
-
 BOOL mg_InitTimer (BOOL use_sys_timer)
 {
     __mg_tick_counter = 0;
@@ -219,7 +124,8 @@ BOOL mg_InitTimer (BOOL use_sys_timer)
     __mg_os_start_time();
 
     if (use_sys_timer) {
-        install_system_timer ();
+        // Since 5.0.14, do nothing.
+        // install_system_timer ();
     }
 
     return TRUE;
@@ -227,8 +133,10 @@ BOOL mg_InitTimer (BOOL use_sys_timer)
 
 void mg_TerminateTimer (BOOL use_sys_timer)
 {
-    if (use_sys_timer)
-        unintall_system_timer ();
+    if (use_sys_timer) {
+        // Since 5.0.14, do nothing.
+        // unintall_system_timer ();
+    }
 }
 
 /************************* Functions run in message thread *******************/
@@ -247,34 +155,21 @@ int __mg_check_expired_timers (MSGQUEUE* msg_queue, DWORD inter)
         int i;
         TIMER** timer_slots = msg_queue->timer_slots;
 
+        __mg_update_tick_count (msg_queue);
+
         for (i = 0; i < DEF_NR_TIMERS; i++) {
             if (timer_slots[i]) {
-                if (__mg_tick_counter >= timer_slots[i]->ticks_expected) {
+                if (msg_queue->last_ticks >= timer_slots[i]->ticks_expected) {
                     /* setting timer flag is simple, we do not need to lock
                        msgq, or else we may encounter dead lock here */
                     msg_queue->expired_timer_mask |= (0x01UL << i);
                     POST_MSGQ (msg_queue);
 
-                    timer_slots[i]->ticks_expected += timer_slots[i]->interv;
-                    timer_slots[i]->ticks_fired = __mg_tick_counter;
+                    timer_slots[i]->ticks_expected =
+                        msg_queue->last_ticks + timer_slots[i]->interv;
+                    timer_slots[i]->ticks_fired = msg_queue->last_ticks;
                     nr++;
                 }
-#if 0   /* deprecated code */
-                timer_slots[i]->count += inter;
-                if (timer_slots[i]->count >= timer_slots[i]->interv) {
-#ifdef _MGRM_PROCESSES
-                    timer_slots[i]->ticks_current = SHAREDRES_TIMER_COUNTER;
-#else
-                    timer_slots[i]->ticks_current = __mg_tick_counter;
-#endif
-                    /* setting timer flag is simple, we do not need to lock msgq,
-                       or else we may encounter dead lock here */
-                    msg_queue->expired_timer_mask |= (0x01UL << i);
-                    POST_MSGQ (msg_queue);
-                    timer_slots[i]->count -= timer_slots[i]->interv;
-                    nr++;
-                }
-#endif /* deprecated code */
             }
         }
     }
@@ -291,12 +186,7 @@ BOOL GUIAPI SetTimerEx (HWND hWnd, LINT id, DWORD interv,
     int i;
     int slot = -1;
     TIMER** timer_slots;
-    PMSGQUEUE pMsgQueue;
-
-#ifndef _MGRM_THREADS
-    /* Force to update tick count */
-    GetTickCount();
-#endif
+    PMSGQUEUE msg_queue;
 
     if (id == 0) {
         _WRN_PRINTF ("bad identifier (%ld).\n", id);
@@ -307,12 +197,14 @@ BOOL GUIAPI SetTimerEx (HWND hWnd, LINT id, DWORD interv,
         interv = 1;
     }
 
-    timer_slots = getTimerSlotsForThisThread (&pMsgQueue);
+    timer_slots = getTimerSlotsForThisThread (&msg_queue);
     if (MG_UNLIKELY (timer_slots == NULL)) {
         _WRN_PRINTF ("called for non message thread\n");
         goto badret;
     }
 
+    __mg_update_tick_count (msg_queue);
+
     /* Since 5.0.0: only check hWnd if timer_proc is NULL */
     if (MG_UNLIKELY (timer_proc == NULL &&
                 !getMainWinIfWindowInThisThread (hWnd))) {
@@ -331,7 +223,7 @@ BOOL GUIAPI SetTimerEx (HWND hWnd, LINT id, DWORD interv,
             /* Since 5.0.0: we reset timer parameters for duplicated call of
                this function */
             timer_slots[i]->interv = interv;
-            timer_slots[i]->ticks_expected = __mg_tick_counter + interv;
+            timer_slots[i]->ticks_expected = msg_queue->last_ticks + interv;
             timer_slots[i]->ticks_fired = 0;
             timer_slots[i]->proc = timer_proc;
             return TRUE;
@@ -348,14 +240,14 @@ BOOL GUIAPI SetTimerEx (HWND hWnd, LINT id, DWORD interv,
     timer_slots[slot]->hWnd = hWnd;
     timer_slots[slot]->id = id;
     timer_slots[slot]->interv = interv;
-    timer_slots[slot]->ticks_expected = __mg_tick_counter + interv;
+    timer_slots[slot]->ticks_expected = msg_queue->last_ticks + interv;
     timer_slots[slot]->ticks_fired = 0;
     timer_slots[slot]->proc = timer_proc;
 
     _DBG_PRINTF ("ticks_expected (%d): %lu, tick_counter: %lu\n",
-            slot, timer_slots[slot]->ticks_expected, __mg_tick_counter);
+            slot, timer_slots[slot]->ticks_expected, msg_queue->last_ticks);
 
-    pMsgQueue->nr_timers++;
+    msg_queue->nr_timers++;
 
     return TRUE;
 
@@ -363,24 +255,6 @@ badret:
     return FALSE;
 }
 
-#if 0   /* deprected code */
-#ifdef _MGRM_PROCESSES
-static void reset_select_timeout (TIMER** timer_slots)
-{
-    int i;
-
-    unsigned int interv = 0;
-    for (i = 0; i < DEF_NR_TIMERS; i++) {
-        if (timer_slots[i]) {
-            if (interv == 0 || timer_slots[i]->interv < interv)
-                interv = timer_slots[i]->interv;
-        }
-    }
-    __mg_set_select_timeout (USEC_10MS * interv);
-}
-#endif
-#endif  /* deprecated code */
-
 void __mg_remove_timer (MSGQUEUE* msg_queue, int slot)
 {
     TIMER** timer_slots;
@@ -470,13 +344,14 @@ BOOL GUIAPI ResetTimerEx (HWND hWnd, LINT id, DWORD interv,
     if (MG_LIKELY (msg_queue)) {
         TIMER** timer_slots = msg_queue->timer_slots;
 
+        __mg_update_tick_count (msg_queue);
         for (i = 0; i < DEF_NR_TIMERS; i++) {
             if (timer_slots[i] &&
                     timer_slots[i]->hWnd == hWnd && timer_slots[i]->id == id) {
                 /* Should clear old timer flags */
                 msg_queue->expired_timer_mask &= ~(0x01UL << i);
                 timer_slots[i]->interv = interv;
-                timer_slots[i]->ticks_expected = __mg_tick_counter + interv;
+                timer_slots[i]->ticks_expected = msg_queue->last_ticks + interv;
                 timer_slots[i]->ticks_fired = 0;
                 if (timer_proc != (TIMERPROC)INV_PTR)
                     timer_slots[i]->proc = timer_proc;
@@ -548,20 +423,6 @@ BOOL GUIAPI HaveFreeTimer (void)
 
 DWORD GUIAPI GetTickCount (void)
 {
-#if defined(_MGRM_PROCESSES)
-    if (mgIsServer) {
-        __mg_tick_counter = __mg_os_get_time_ticks ();
-        SHAREDRES_TIMER_COUNTER = __mg_tick_counter;
-    }
-    else {
-        __mg_tick_counter = SHAREDRES_TIMER_COUNTER;
-    }
-#elif defined(_MGRM_STANDALONE)
-    __mg_tick_counter = __mg_os_get_time_ticks ();
-#else   /* not defined _MGRM_PROCESSES and _MGRM_PROCESSES */
-    /* do nothing here because the desktop thread updates the tick count */
-#endif  /* not defined _MGRM_PROCESSES and _MGRM_PROCESSES */
-
-    return __mg_tick_counter;
+    return __mg_update_tick_count(getMsgQueueForThisThread ());
 }