I've noticed that since upgrading to Snow Leopard this morning Flash videos and ads seem to be using a lot more CPU power, hence causing my fans to spin all the way up whenever I watch an HQ YouTube video or visit a Flash-busy webpage, including some on MacRumors... This is running on my MacBook Pro with a 2.4GHz Core 2 Duo CPU. It seems that Flash is taking up roughly double the CPU power that it did on Leopard. See the attached screen shot and you'll see that Flash Player comes up as an individual Safari plug-in in Activity Monitor. It averages around 95% when watching a YouTube video. That's almost an entire core's worth of power being used (since each core contributes a 100% value, dual-core totals 200%). Has anyone else experienced this?