Question / Help CPU USAGE SKYROCKETING!

so i have a i7 4470 and i am running world of warcraft on ultra with 100fps and cpu usage 20-30%. so when i try to record with obs my fps go down to about 70 and i am fine with that but cpu usage goes to 100% and obs starts lagging. and the footage lags. so i tried putting world of warcraft down to the lower quality and now i have 200fps and like 10-20CPU usage. and then again i start recording and fps goes down to 150 and cpu usage to 60% but i still think that is kinda high. it did not do that before. after i updated obs it started happening. Anything i should be doing to fix it? i tried alot of tutorials but nothing worked.
 
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