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Well I just re-enabled SPDY in Firefox (had it explicitly disabled since last time).

Initial impressions: Downloads are not smooth.

Overall speed seems fine, but SPDY causes spikes of very_slow->fast_burst->very_slow->fast_burst per image download, when downloading multiple images.

It doesn't seem to do a good job of balancing available speed over multiple downloads. Most likely just a limitation of this SPDY v2 implementation. Instead of streaming packets of multiple image downloads concurrently, it instead seems to alternate exclusive use of the SPDY connection every half-second or so.

Impression #2: Thumbnails and other pages load slightly out-of-sync and a split-second slower with SPDY enabled. (vs HTTP pipelining)