Same thing happens to me. However, SOME videos would load fast and others would load slow.
I actually talked to my ISP and found some interesting information. They keep google servers ON the ISP's network which caches youtube videos and other google content. This really surprised me, but I bet it's an incredibly common practice. Thus things cached on your ISP's network I imagine would load quickly, but if it's not and has to fetch the video from the actual google servers I reckon they'll be pretty slow.
I actually talked to my ISP and found some interesting information. They keep google servers ON the ISP's network which caches youtube videos and other google content. This really surprised me, but I bet it's an incredibly common practice. Thus things cached on your ISP's network I imagine would load quickly, but if it's not and has to fetch the video from the actual google servers I reckon they'll be pretty slow.