Question / Help OBS Lags when the window focuses on game, it doesnt lag when focuses on OBS

So I'm new to this obs and just started to record my game. I had looking for the answer in many obs threads and still cannot fix my problem.
I tried to record my DOTA 2 game with OBS and try to see the results. I've notice that when my window is focused on DOTA2, the OBS fps is dropping. is it just because my CPU is not powerful enough to record game? but when i see the task manager they only takes like 50% of my CPU. I dont question the dropping fps when i tried to stream to test because the CPU reach around 90%. but the weird thing is the stream result videos is better than the recording videos.
I've attached my log files
 

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