diff --git a/src/cache.h b/src/cache.h
index 203e2a5..820bd01 100644
--- a/src/cache.h
+++ b/src/cache.h
@@ -593,6 +593,8 @@ struct WaterCache {
     }
 
     void renderMask() {
+        if (!visible) return;
+        PROFILE_MARKER("WATER_RENDER_MASK");
     // mask underwater geometry by zero alpha
         game->setShader(Core::passWater, Shader::WATER_MASK);
         Core::active.shader->setParam(uTexParam, vec4(1.0f));
@@ -626,6 +628,8 @@ struct WaterCache {
     }
 
     void getRefract() {
+        if (!visible) return;
+        PROFILE_MARKER("WATER_REFRACT");
         int w, h;
         getTargetSize(w, h);
     // get refraction texture
@@ -637,6 +641,7 @@ struct WaterCache {
     }
 
     void simulate() {
+       PROFILE_MARKER("WATER_SIMULATE");
     // simulate water
         Core::setDepthTest(false);
         Core::setBlending(bmNone);
@@ -657,6 +662,7 @@ struct WaterCache {
 
     void renderReflect() {
         if (!visible) return;
+        PROFILE_MARKER("WATER_REFLECT");
 
         for (int i = 0; i < count; i++) {
             Item &item = items[i];
@@ -698,6 +704,8 @@ struct WaterCache {
     }
 
     void render() {
+        if (!visible) return;
+        PROFILE_MARKER("WATER_RENDER");
         for (int i = 0; i < count; i++) {
             Item &item = items[i];
             if (!item.visible) continue;
diff --git a/src/core.h b/src/core.h
index d1f3dca..1440367 100644
--- a/src/core.h
+++ b/src/core.h
@@ -288,13 +288,41 @@ namespace Core {
 }
 
 #ifdef PROFILE
+   #define USE_CV_MARKERS
+
+   #ifdef USE_CV_MARKERS
+       #include <libs/cvmarkers/cvmarkersobj.h>  
+       using namespace Concurrency::diagnostic;
+
+       marker_series *series[256];
+       int seriesIndex;
+   #endif
+
     struct Marker {
+        #ifdef USE_CV_MARKERS
+            span *cvSpan;
+        #endif
+
         Marker(const char *title) {
             if (Core::support.profMarker) glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 1, -1, title);
+            #ifdef USE_CV_MARKERS
+                marker_series *&s = series[seriesIndex];
+                if (s == NULL) {
+                   char seriesTitle[64];
+                   sprintf(seriesTitle, "events - %d", seriesIndex);
+                   s = new marker_series(seriesTitle);
+                }
+                cvSpan = new span(*s, normal_importance, _T(title));
+                seriesIndex++;
+            #endif
         }
 
         ~Marker() {
             if (Core::support.profMarker) glPopDebugGroup();
+            #ifdef USE_CV_MARKERS
+                delete cvSpan;
+                seriesIndex--;
+            #endif
         }
 
         static void setLabel(GLenum id, GLuint name, const char *label) {
diff --git a/src/game.h b/src/game.h
index 6e5fc5e..080c626 100644
--- a/src/game.h
+++ b/src/game.h
@@ -67,6 +67,7 @@ namespace Game {
     }
 
     void update(float delta) {
+        PROFILE_MARKER("UPDATE");
         Input::update();
 
         if (Input::down[ikV]) { // third <-> first person view
@@ -85,6 +86,7 @@ namespace Game {
     }
 
     void render() {
+        PROFILE_MARKER("RENDER");
         PROFILE_TIMING(Core::stats.tFrame);
         Core::beginFrame();
         level->render();
diff --git a/src/platform/win/main.cpp b/src/platform/win/main.cpp
index f60d9e5..af7e375 100644
--- a/src/platform/win/main.cpp
+++ b/src/platform/win/main.cpp
@@ -372,8 +372,8 @@ int main(int argc, char** argv) {
             joyUpdate();
 
             DWORD time = getTime();
-            if (time <= lastTime)
-                continue;
+            //if (time <= lastTime)
+            //    continue;
 
             EnterCriticalSection(&sndCS);
             Game::update((time - lastTime) * 0.001f);