When I'm typing into a web form, like writing this post for instance, there is a considerable amount of input lag. Meaning the cursor will not progress forward with new characters that are typed as I'm tying them. It'll lag for a moment, then display the characters that I've typed at super speed, then be OK for a moment, then lag again. It only happens on Safari, only in web forms, like this forum, Amazon reviews, eBay reviews, etc. It's starting to drive me crazy. I'm using a fairly powerful Mac, (Mac Pro 4,1, 2x2.93Gz Xeons, 48Gb RAM, ATI 7970 3GB Video, 2x 256GB SSD in Raid 0) I've tried clearing all web data in menu > preferences, erasing the cache in ~/Library/Caches and I have no extensions installed.