I have a flash movie that does hardly anything except move 1 thing down the screen.
It runs at 100 (I tried less - it's not smooth enough).
In Flash and Firefox, it runs at 100 fps as I have set.
In IE it runs at what looks like about 30fps, though it looks like a cap is in place!

I'm using a timer method, NOT the enterframe method here, so in theory my fps shouldn't matter.
Every 10ms, it basically does canvas.y = canvas.y + (tempo/59.5)
Nothing else at all!

In firefox it works perfectly it seems, but in IE it doesn't.
But in IE it's moving down the screen far too slowly to keep up with the music!

You can test it at http://www.funkimunkibadges.co.uk/gh/GHv3.html
Pick the 2nd or 3rd one, not the top one!

ps. It will stutter slightly as it checks and re-syncs with the song every 2 seconds.

Thanks!