Hello, browser becomes very slow when trying to play flash game, http://www.loglod.org/play-game/9977-Red-Ball-4-Volume-3 this one
I can't reproduce a WebKit problem here – playing this game WebKit is basically idle.
Flash is using ~70% CPU, and that's on a fast laptop – so on slower machines this could definitely be a problem. You'll have to either file a bug with Adobe, or with the site – there's nothing we can do about this in WebKit.
(But please do reopen this bug if you have specific data showing a problem in WebKit that I'm not seeing).