How to disable auto frameskip?

Hello, I'm new here.
For some reason I want to use Bandicam to limit the game fps to slow down the game speed on RPCS3 without breaking audio. But I found RPCS3 will automaticaly double the game speed once the frame rate is below than 1/2 of normal. That halved my deceleration and lost(skipped) a lot of frames.
I'm not sure this is 100% caused by PRCS3. Any way is there a way to disable this?

RPCS3 doesn't have auto frameskip, however specific games tend to skip frames if their performance is unstable/low.