That's too bad, are you playing in the browser or downloaded version? I hope you will try it again in the future. The next update will feature the ability to disable lighting effects for better performance.
browser, might try the standalone version though. yeah, in the level where it first tells you to circle wing, I jsut cant get up to the top left cause as soon as I reach proper speeds, only every 4th or so frame is visible. might be just my shiet internet connection though :-)