Stuttering while trying to record games and still having over a 100 fps

[Frozo124]

Me and my friends are trying to record league of legends funny moments, so I try to record using Obs at 1080p 60fps. 30fps is just fine but when I try 60fps, there is random stuttering in the game even though I'm getting 150 fps and the recorded gameplay looks horrible and godly at different parts. I have an i5 4690k and a r9 280x and I get around 250 fps not recording and 150 while recording but with stuttering. I have tried to change the priority of the recording. Do I have the wrong bitrate? I don't know and I need help to fix this or is this just my processor can't keep up.

 

[imrazor]

Might be disk i/o. Are you recording to an SSD or a hard drive?