Question / Help Problems with low fps

[thugstrempis]

Hi, im having problems with low fps, sometimes i can stream whit my game(League of Legends) fps in 100+. But, sometimes when i inicialize the stream, my fps drops to less than 60


LOG : http://pastebin.com/QBwSVkbv#


Anyone knows what could it be ?
Thanks, and sorry for my bad english