source/blender/blenkernel/BKE_paint.h                 |  2 ++
 source/blender/editors/sculpt_paint/paint_stroke.c    |  4 +++-
 source/blender/editors/sculpt_paint/sculpt.c          | 17 +++++++++++++++--
 source/blender/windowmanager/WM_types.h               |  1 +
 source/blender/windowmanager/intern/wm_event_system.c |  7 +++++--
 5 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/source/blender/blenkernel/BKE_paint.h b/source/blender/blenkernel/BKE_paint.h
index db35fbde2c8..9f8a7f808c2 100644
--- a/source/blender/blenkernel/BKE_paint.h
+++ b/source/blender/blenkernel/BKE_paint.h
@@ -324,6 +324,8 @@ typedef struct SculptSession {
   float init_pivot_rot[4];
   float init_pivot_scale[3];
 
+  double last_redraw;
+
   union {
     struct {
       struct SculptVertexPaintGeomMap gmap;
diff --git a/source/blender/editors/sculpt_paint/paint_stroke.c b/source/blender/editors/sculpt_paint/paint_stroke.c
index 372ea954630..7e4a3fd0c0f 100644
--- a/source/blender/editors/sculpt_paint/paint_stroke.c
+++ b/source/blender/editors/sculpt_paint/paint_stroke.c
@@ -1323,7 +1323,7 @@ static void paint_stroke_line_constrain(PaintStroke *stroke, float mouse[2])
     mouse[1] = stroke->constrained_pos[1] = len * sinf(angle) + stroke->last_mouse_position[1];
   }
 }
-
+int in_stroke = 0;
 int paint_stroke_modal(bContext *C, wmOperator *op, const wmEvent *event)
 {
   Paint *p = BKE_paint_get_active_from_context(C);
@@ -1380,6 +1380,7 @@ int paint_stroke_modal(bContext *C, wmOperator *op, const wmEvent *event)
 
   /* one time stroke initialization */
   if (!stroke->stroke_started) {
+    in_stroke = 1;
     stroke->last_pressure = sample_average.pressure;
     copy_v2_v2(stroke->last_mouse_position, sample_average.mouse);
     if (paint_stroke_use_scene_spacing(br, mode)) {
@@ -1422,6 +1423,7 @@ int paint_stroke_modal(bContext *C, wmOperator *op, const wmEvent *event)
 
   if (event->type == stroke->event_type && !first_modal) {
     if (event->val == KM_RELEASE) {
+      in_stroke =0;
       copy_v2_fl2(mouse, event->mval[0], event->mval[1]);
       paint_stroke_line_constrain(stroke, mouse);
       paint_stroke_line_end(C, op, stroke, mouse);
diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index a9334edd39b..d283e0dc045 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -35,6 +35,8 @@
 
 #include "BLT_translation.h"
 
+#include "PIL_time.h"
+
 #include "DNA_customdata_types.h"
 #include "DNA_mesh_types.h"
 #include "DNA_meshdata_types.h"
@@ -7482,6 +7484,8 @@ static void sculpt_brush_stroke_init(bContext *C, wmOperator *op)
 
   is_smooth = sculpt_needs_connectivity_info(brush, ss, mode);
   BKE_sculpt_update_object_for_edit(depsgraph, ob, is_smooth, need_mask);
+
+  ss->last_redraw = PIL_check_seconds_timer();
 }
 
 static void sculpt_restore_mesh(Sculpt *sd, Object *ob)
@@ -7536,7 +7540,6 @@ static void sculpt_flush_update_step(bContext *C, SculptUpdateType update_flags)
     /* Slow update with full dependency graph update and all that comes with it.
      * Needed when there are modifiers or full shading in the 3D viewport. */
     DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
-    ED_region_tag_redraw(ar);
   }
   else {
     /* Fast path where we just update the BVH nodes that changed. */
@@ -7548,8 +7551,18 @@ static void sculpt_flush_update_step(bContext *C, SculptUpdateType update_flags)
        * draw_mesh_object(). [#33790] */
       sculpt_update_object_bounding_box(ob);
     }
-
+  }
+#if 1
+  double tdraw = PIL_check_seconds_timer();
+  bool redraw = (tdraw - ss->last_redraw) > (1.0f / 30.0f);
+#else
+  bool redraw = true;
+#endif
+  if (redraw) {
     ED_region_tag_redraw(ar);
+#if 1
+    ss->last_redraw = tdraw;
+#endif
   }
 }
 
diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index e9e4b7c6d12..2bd30506fcf 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -550,6 +550,7 @@ typedef struct wmEvent {
 
   /** Tablet info, only use when the tablet is active. */
   const struct wmTabletData *tablet_data;
+  double time_stamp;
 
   /* custom data */
   /** Custom data type, stylus, 6dof, see wm_event_types.h */
diff --git a/source/blender/windowmanager/intern/wm_event_system.c b/source/blender/windowmanager/intern/wm_event_system.c
index d90eab6f94f..c64276ef5b5 100644
--- a/source/blender/windowmanager/intern/wm_event_system.c
+++ b/source/blender/windowmanager/intern/wm_event_system.c
@@ -124,7 +124,7 @@ wmEvent *wm_event_add_ex(wmWindow *win,
   wmEvent *event = MEM_mallocN(sizeof(wmEvent), "wmEvent");
 
   *event = *event_to_add;
-
+  event->time_stamp = PIL_check_seconds_timer();
   update_tablet_data(win, event);
 
   if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
@@ -160,9 +160,12 @@ wmEvent *WM_event_add_simulate(wmWindow *win, const wmEvent *event_to_add)
   win->eventstate->y = event->y;
   return event;
 }
-
+extern int in_stroke ;
 void wm_event_free(wmEvent *event)
 {
+  if (event->type == MOUSEMOVE && in_stroke==1)
+      printf("%.8f\n", (PIL_check_seconds_timer() - event->time_stamp) *1000 );
+ 
   if (event->customdata) {
     if (event->customdatafree) {
       /* note: pointer to listbase struct elsewhere */