diff --git a/src/main.cpp b/src/main.cpp
index 6a961a3..21b5669 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -248,6 +248,7 @@ updateOrbit(TwoBodySystem sys, Entity& ellipse_entity)
 #endif
 }
 
+// FIXME: this needs some helpers
 void
 preFrameCallback(RenderState* rs, void* user_data = nullptr)
 {
@@ -308,7 +309,7 @@ postFrameCallback(RenderState* rs, void* user_data = nullptr)
 	gooDraw(rs->handles.window, (GameState*) user_data);
 }
 
-#define DEFAULT_SIM_SPEED 2000
+#define DEFAULT_SIM_SPEED 500
 #define GAME_ARENA_SIZE 16 * 1024 * 1024	// 16MB
 #define DEFAULT_MAX_ORBITS 10000
 int