Why is YouTube slow on wifi?

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http://forums.androidcentral.com – Whenever I am watching YouTube on wifi it is constantly buffering. I often have to switch off "HD" just finish the damn video. When I'm on 4G its fast and no buffering. I have an N router on fios. It isn't just my wifi its any wifi. I'll post my speeds for wifi and 4G I don't see any reason it should perform so badly over wifi. Anyone else have this issue? 4G Wifi Sent from my Galaxy Nexus using Android Central Forums (HowTos)