@rockaddicted Sorry for the late reply, It is on Recalbox 4.0.1. I do know psx games will not run well on the Pi1, but I would like to get Recalbox working at RetroPie's speed first before I make the upgrade.

Taking from my Reddit post:

Running Crash Bandicoot: Warped on RetroPie is better than running it on Recalbox, and I'm wondering how I can fix that because I'm really preferring Recalbox right now. I have noticed this difference between the two, where the background in the loading menu is rendered smooth in Recalbox but not in RetroPie and I'm thinking that may have something to do with it. Here's pictures: http://imgur.com/a/mrJY7

I've mangled the settings trying to fix this so the games will look a bit different than the default settings, but the effects have been happening since day 1 and are the reason for me changing the settings in the first place.

And that's it, why is there a difference in the rendering (AFAIK they're using the same PSX emulator), is that causing the slowdown, and how can I get Recalbox looking the same as RetroPie to fix it? I'm doing this on a Raspberry Pi 1 B+ which I know even overclocked will not handle this game, but I would like to see if I can get this fixed before moving to a faster Pi.

A Reddit user suggested turning off smooth games and shaders, but those didn't affect it.