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Why is it that any website with a fixed element on the screen is so damn laggy?
Old browser? Works fine with Firefox 8.
Rather sluggish in Chrome beta here. I've always found this to be the case, though. Twitter, Gawkers's redesign, etc.
Loading fine here in chrome dev 17.
I've been using Rackspace cloud for a couple of clients and reckon they're lagging far behind Amazon and the other providers. They've bet the farm on the OpenStack project but given the number of players involved (over a hundred!) the pace of progress is glacial. It lacks really fundamental features (no private backend network, no elastic load balancing, no [public] support for elastic IP's) and these problems make it a pain to use for all but small projects.

In fact the only reasons I can think of to recommend it right now are the generous pricing and the way their cloud instances are more VPS-ish (i.e. unlikely to lose local state) than EC2's.