Problem project64 1.7 castlevania

[NickMat]

Hello there , im new to this community and thats because so far i could find a asnwer about my problems with the emulator. but now i did not.

So i got project64 1.7.0.49 ,i got it because i wanted to see if it fixes yoshi story because i love it, and it does. yey

but my problem is that, when i play castlevania 1, or 2 whenever i fight monsters , or when they are near my fPS got low (15-30) and it makes it crappy to play, as far as i remember it was ok with 1,6 ...

could it be rom problem? but both roms?

any option to fix that on emulator? or what