I'm making a game and I'm getting a butter-smooth 30fps when testing through the IDE (Flash CS5.5, Test Movie) but if I run the SWF in a browser, an EXE projector file or directly in the standalone player (latest version 11) the frame rate drops to a crappy 20fps or less.

Any ideas? It did this with player 10.1, 10.2, 11... There doesn't seem to be any specific player as a culprit, just *anything* outside the Flash Pro IDE.

This problem happens on an intel i3 quadcore 3ghz with 3GB RAM running (gulp) XP SP3

(Testing on a windows 7 computer, i5 quadcore 2.6Ghz, 4GB RAM it runs butter-smooth in all tests.)