Index: src/newgrf_engine.cpp
===================================================================
--- src/newgrf_engine.cpp	(revision 24932)
+++ src/newgrf_engine.cpp	(working copy)
@@ -1015,6 +1015,7 @@
 	return e->grf_prop.spritegroup[CT_DEFAULT];
 }
 
+int _test_count = 0;
 
 SpriteID GetCustomEngineSprite(EngineID engine, const Vehicle *v, Direction direction, EngineImageType image_type)
 {
@@ -1022,6 +1023,8 @@
 	const SpriteGroup *group = SpriteGroup::Resolve(GetVehicleSpriteGroup(engine, v), &object);
 	if (group == NULL || group->GetNumResults() == 0) return 0;
 
+	_test_count++;
+
 	return group->GetResult() + (direction % group->GetNumResults());
 }
 
Index: src/viewport.cpp
===================================================================
--- src/viewport.cpp	(revision 24932)
+++ src/viewport.cpp	(working copy)
@@ -1534,6 +1534,8 @@
 	}
 }
 
+int _test_count2 = 0;
+
 static inline void ViewportDraw(const ViewPort *vp, int left, int top, int right, int bottom)
 {
 	if (right <= vp->left || bottom <= vp->top) return;
@@ -1548,6 +1550,8 @@
 	if (top < vp->top) top = vp->top;
 	if (bottom > vp->top + vp->height) bottom = vp->top + vp->height;
 
+	_test_count2++;
+
 	ViewportDrawChk(vp, left, top, right, bottom);
 }
 
Index: src/openttd.cpp
===================================================================
--- src/openttd.cpp	(revision 24932)
+++ src/openttd.cpp	(working copy)
@@ -1288,6 +1288,9 @@
 	}
 }
 
+extern int _test_count;
+extern int _test_count2;
+
 /**
  * State controlling game loop.
  * The state must not be changed from anywhere but here.
@@ -1345,6 +1348,12 @@
 		cur_company.Restore();
 	}
 
+	if (_tick_counter % 33 == 0) {
+		printf("Lookups %d, draws %d\n", _test_count, _test_count2);
+		_test_count = 0;
+		_test_count2 = 0;
+	}
+
 	assert(IsLocalCompany());
 }