diff --git a/src/core/lv_refr.c b/src/core/lv_refr.c
index 79af77884..ad47846af 100644
--- a/src/core/lv_refr.c
+++ b/src/core/lv_refr.c
@@ -380,7 +380,6 @@ void _lv_display_refr_timer(lv_timer_t * tmr)
     if(disp_refr->inv_p == 0) goto refr_finish;
 
     /*If refresh happened ...*/
-    /*Call monitor cb if present*/
     lv_display_send_event(disp_refr, LV_EVENT_RENDER_READY, NULL);
 
     if(!lv_display_is_double_buffered(disp_refr) ||
diff --git a/src/others/sysmon/lv_sysmon.c b/src/others/sysmon/lv_sysmon.c
index d92dc6bed..078018a55 100644
--- a/src/others/sysmon/lv_sysmon.c
+++ b/src/others/sysmon/lv_sysmon.c
@@ -149,11 +149,13 @@ static void perf_update_timer_cb(lv_timer_t * t)
     info->calculated.cpu = 100 - lv_timer_get_idle();
     info->calculated.refr_avg_time = info->measured.refr_cnt ? (info->measured.refr_elaps_sum / info->measured.refr_cnt) :
                                      0;
-    info->calculated.render_avg_time = info->measured.render_cnt ? (info->measured.render_elaps_sum /
-                                                                    info->measured.render_cnt) : 0;
     info->calculated.flush_avg_time = info->measured.flush_cnt ? (info->measured.flush_elaps_sum / info->measured.flush_cnt)
                                       : 0;
-    info->calculated.render_real_avg_time = info->calculated.render_avg_time + info->calculated.flush_avg_time;
+    info->calculated.render_avg_time = info->measured.render_cnt ? (info->measured.render_elaps_sum /
+                                                                    info->measured.render_cnt) : 0;
+
+    /*Flush time was measured in rendering time*/
+    info->calculated.render_avg_time -= info->calculated.flush_avg_time;
 
     info->calculated.cpu_avg_total = ((info->calculated.cpu_avg_total * (info->calculated.run_cnt - 1)) +
                                       info->calculated.cpu) / info->calculated.run_cnt;
@@ -190,7 +192,8 @@ static void perf_observer_cb(lv_observer_t * observer, lv_subject_t * subject)
         "%" LV_PRIu32" FPS, %" LV_PRIu32 "%% CPU\n"
         "%" LV_PRIu32" ms (%" LV_PRIu32" | %" LV_PRIu32")",
         perf->calculated.fps, perf->calculated.cpu,
-        perf->calculated.render_real_avg_time, perf->calculated.render_avg_time, perf->calculated.flush_avg_time
+        perf->calculated.render_avg_time + perf->calculated.flush_avg_time,
+        perf->calculated.render_avg_time, perf->calculated.flush_avg_time
     );
 #endif /*LV_USE_PERF_MONITOR_LOG_MODE*/
 }
diff --git a/src/others/sysmon/lv_sysmon.h b/src/others/sysmon/lv_sysmon.h
index 9016ddc16..bb4fb0b79 100644
--- a/src/others/sysmon/lv_sysmon.h
+++ b/src/others/sysmon/lv_sysmon.h
@@ -48,7 +48,7 @@ typedef struct {
         uint32_t refr_elaps_sum;
         uint32_t refr_cnt;
         uint32_t render_start;
-        uint32_t render_elaps_sum;
+        uint32_t render_elaps_sum; /*Contains the flush time too*/
         uint32_t render_cnt;
         uint32_t flush_start;
         uint32_t flush_elaps_sum;
@@ -59,9 +59,8 @@ typedef struct {
         uint32_t fps;
         uint32_t cpu;
         uint32_t refr_avg_time;
-        uint32_t render_avg_time;
-        uint32_t flush_avg_time;
-        uint32_t render_real_avg_time;
+        uint32_t render_avg_time;       /**< Pure rendering time without flush time*/
+        uint32_t flush_avg_time;        /**< Pure flushing time without rendering time*/
         uint32_t cpu_avg_total;
         uint32_t fps_avg_total;
         uint32_t run_cnt;