I have noticed of late - lets say the last few weeks at least, that hi-def 1080p [possibly 720p also] 'tubes played via Chrome are laggy - choppy where in the past the exact same had been like butter. I had wondered if something about my internal lan was deteriorating but running speedtest I'm actually getting excellent full-throttle everywhere.
I had just reinstalled fresh 7 Ulti x64 on my lab mule, and installed IE10 as I have done on my carry weapon [thinkpad]... I thought I'd test such things on my big screen 46" Sony. via Chrome 23.0.1271.95 pulled up a youtube link I'm very familiar with, flipped on fullscreen and 1080p and let it rip. choppy... to me it appeared that the network couldn't keep up so I did the standard trick of halting and backing the vid to let the buffer gain some headroom. visually it looked like this was having no effect.
So I stopped all that, shutdown chrome, opened IE10 and did the same vid there.
Voila' - the vid played silky smooth and the visual buffer indication was running well ahead of the frames.
I'm wondering if, in order to constrain explosive growth in bandwidth-demand at Youtube, if Google slipped a throttling function into Chrome specifically to constrain bandwidth on their property?