Speed problems in some Japanese games

The games are Tobal no. 2 and Bushido Blade from Squaresoft. They slow down significantly when the fight starts.

What can I do to fix the speed problem without overclocking the system?

Is changing the resolution be any good?

It’s a psx games. I’m running Retropie 4.1 and have a raspberry pi 3 model B.

Thanks guys!

Yeah, make sure you disable the double-resolution core option. EDIT: rewind can cause framedrops with pcsx-rearmed, too.

Where is the double-resolution so I can disable it? And also where’s the rewind option?

Thanks @hunterk

the resolution thing is in the core options and rewind is in settings > frame-throttle > rewind