How to bypass youtube's local cache?

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http://unix.stackexchange.com – Youtube performance here in Brazil has been terrible lately. Checking my browser's activity I can see that my ISP has a local youtube cache and serves videos in 1.7mb chunks. Talking to some friends we verified that at least 2 of the major ISPs in Brazil are doing this. I know that I could use a proxy to direct my traffic, but I dont want to do it for everything, as its only youtube thats been really making me mad. What could I do to skip that local cache just for youtube? I use mac os on my personal computer, but have linux and windows boxes around the house, a solution for any of them wou (HowTos)