GammaOS Dreamcast performance question

Hey guys, question for those out there using gammaOS, I feel like I'm doing something wrong, performance of dreamcast feels way to bad.

I am getting best results using standalone redream, but still I feel like performance isn't great like for example cannon spike is an easy one to run and it's not full speed and using retroarch is almost unplayable.

so my question is, are you getting good performance or is worst than stock? I'm quite sure I'm doing something wrong since it can't be so bad.