A "jillion" sprites? That's not good, however many a "jillion" is. I strongly suggest that you rethink your level and replace sprites with models if you can, unless, of course, you've got a good reason for having that many.... To test if the speed was changed, all you have to do is delete the "my.dymanic = off" line, test run the engine, and note the fps. Then add the line back in and test again. Normally, there would be a detectable change if this was the case.