Stream lags while streaming GW, not sc2?

[spirates1]

Well I've been streaming some sc2 with xplit -> twitch without any problems. Then I start to stream gw2 with excactly the same settings ( same profile) as I have when streaming sc2, and the stream fucking lags..

I dont lag in game, so why does the stream lag? Makes no sense to me. I know GW2 is more CPU intensive then SC2 but that would only affect my own FPS in the game right? I have a 30-40 fps in the game at all times but the stream fucking lags anyway, I dont understand it.

Here is a video showing some of the streamlag, it can however be way worse then this.. Sorry for the retardly big webcam aswell, thats unintented.

http://sv.twitch.tv/spirates1/b/332042520

I had fraps open while recording this just to see my FPS, and at times I had 60 fps in game, the stream lags as you can see..

So why?