diff --git a/game.c b/game.c
index 73662ff..c9d9b0a 100644
--- a/game.c
+++ b/game.c
@@ -1,6 +1,7 @@
 #include <assets.h>
 #include <game.h>
 #include <SDL2/SDL.h>
+#include <stdbool.h>
 #include <time.h>
 
 int sleepNanos(long int ns) {
@@ -10,24 +11,52 @@ int sleepNanos(long int ns) {
     return nanosleep(&time, NULL);
 }
 
-#define MAX_STEP_CLOCKS 20000
+typedef struct {
+    GraphicsContext *gfx;
+} GameState;
+
+int onFrame(VB *sim) {
+    static uint8_t leftEye[384*224];
+    static uint8_t rightEye[384*224];
+    GameState *state;
+    GraphicsContext *gfx;
+
+    state = vbGetUserData(sim);
+    gfx = state->gfx;
+    
+    vbGetPixels(sim, leftEye, 1, 384, rightEye, 1, 384);
+    gfxUpdateLeftEye(gfx, leftEye);
+    gfxUpdateRightEye(gfx, rightEye);
+    gfxRender(gfx);
+    return 1;
+}
+
+#define MAX_STEP_CLOCKS 20000000
 
 int runGame(VB *sim, GraphicsContext *gfx) {
     uint32_t clocks;
     SDL_Event event;
+    GameState state;
+    uint64_t ticks, prevTicks;
+
+    state.gfx = gfx;
+    vbSetUserData(sim, &state);
+    vbSetFrameCallback(sim, &onFrame);
 
     gfxUpdateLeftEye(gfx, LEFT_EYE_DEFAULT);
     gfxUpdateRightEye(gfx, RIGHT_EYE_DEFAULT);
 
+    prevTicks = SDL_GetTicks64();
     while (1) {
         clocks = MAX_STEP_CLOCKS;
         vbEmulate(sim, &clocks);
-        gfxRender(gfx);
+        ticks = SDL_GetTicks64();
         while (SDL_PollEvent(&event)) {
             if (event.type == SDL_QUIT) {
                 return 0;
             }
         }
-        sleepNanos((MAX_STEP_CLOCKS - clocks) * 50);
+        sleepNanos(((MAX_STEP_CLOCKS - clocks) * 50) - (ticks - prevTicks) * 1000);
+        prevTicks = ticks;
     }
 }
diff --git a/graphics.c b/graphics.c
index 6c3c0eb..4eb15b7 100644
--- a/graphics.c
+++ b/graphics.c
@@ -40,14 +40,14 @@ int gfxInit(GraphicsContext *gfx) {
         fprintf(stderr, "Error creating left eye texture: %s\n", SDL_GetError());
         goto cleanup_window;
     }
-    SDL_SetTextureColorMod(gfx->leftEye, 255, 0, 0);
+    SDL_SetTextureColorMod(gfx->leftEye, 0xff, 0, 0);
 
     gfx->rightEye = SDL_CreateTexture(gfx->renderer, SDL_PIXELFORMAT_RGB24, SDL_TEXTUREACCESS_STREAMING, 384, 224);
     if (!gfx->rightEye) {
         fprintf(stderr, "Error creating left eye texture: %s\n", SDL_GetError());
         goto cleanup_left_eye;
     }
-    SDL_SetTextureColorMod(gfx->rightEye, 0, 0, 255);
+    SDL_SetTextureColorMod(gfx->rightEye, 0, 0xc6, 0xf0);
     SDL_SetTextureBlendMode(gfx->rightEye, SDL_BLENDMODE_ADD);
 
     return 0;
diff --git a/makefile b/makefile
index 62f6b92..ab15d20 100644
--- a/makefile
+++ b/makefile
@@ -15,4 +15,5 @@ build:
 		$(SHROOMSFLAGS) $(SDL2FLAGS) \
 		-D POSIX_C_SOURCE=199309L \
 		-o shrooms-vb \
+		-O3 -fno-strict-aliasing \
 		-Werror -std=c90 -Wall -Wextra -Wpedantic
\ No newline at end of file
diff --git a/shrooms-vb-core b/shrooms-vb-core
index 767675e..37b9a94 160000
--- a/shrooms-vb-core
+++ b/shrooms-vb-core
@@ -1 +1 @@
-Subproject commit 767675eb42254613170e937b5b67bd9c109a9cf8
+Subproject commit 37b9a943384a230b93089b7617d1b3f5344480d7