I find that YouTube is almost unusable on Safari on my MacBook Pro (17", i7, plenty of RAM). It's very slow, lots of beach ball, video lags sound, generally sluggish and unresponsive. If I switch over to Firefox it works fine, but it's a pain to copy a link over to Firefox anytime I want to watch a YouTube video, whether inline or directly on YouTube. Anyone else experienced this? Any fixes? The only suggestion I found via a Google search was to repair permissions, but that didn't help. Thanks.