[itsmin]

First off, thanks for the kind words! You shouldn't be seeing a significant difference in performance on IE (6-8). We'll look into the alert boxes, are you in Chrome on Windows? We currently don't charge for use of the services. And, absolutely looking at dealing with multiplayer in the future.

[teach]

I did see a pretty significant slowdown on IE7 (XP service pack 3) in the Crystal Galaxy demo in the section where there's a wall down the center of the screen and a big mass of the "bubbles" both above and below. By the end of that, it's really chugging.

Firefox 3.5.4 is really smooth, though, and IE7 is surprisingly smooth even then.