Recommendations For Better Performance

I've been playing downpour and it was kinda good with few framerate drops (Just in void chases it went bad) however it wasn't a big deal. But now I'm the final boss and the low framerate is almost impeding me to do anything and it is impossible for me to make the rapid button processes because the emulator acts like if I'm not doing anything.
Have you some advice on how to configure the emulator for a more decent framerate on Downpour?