@mitu Ah I see! That makes a lot of sense. I've got it now thanks! Just need to figure out what buttons I've got and it's all dandy. Although I guess I also need to map some of them so I can still exit retroarch.

@Katzenfutter To be fair, I just played that first scene a few times on my end and no significant slowdown on the Pi3 nor the Pi4. I am convinced at this stage that i might either be an options thing (do send them over) or just your memory tricking us in that that same slowdown probably occurred on the real hardware.

That did it. Thank you. Problem solved.

Removed everything named "ULES01372". Still got my save games.
(Did not work via SSH, becaus I was in a wrong folder. My fault.)

I think MGS uses all 8 buttons and yours has six right?

Edit : I looked at a picture and it seems you have enough buttons on there.

@mitu i figured it out- I didnt realize you can still save the traditional way on a pi

Good to go!

@bobharris Yeah this version works just fine. Just to sad that it's not in german. Thank you

@dankcushions Okay cool, thanks! For the bit of time I tried without the speed hack it seemed to run smoothly but I'll turn on the FPS counter to confirm. So the speed hack does exactly what it says, speeds it up, I guess it was self-explanatory after all.

@NovaTheMighty

Unfortunately, there have always been emulation issues regarding this game. Before 2004 it was completely unplayable on any emulator past the abandoned factory. It might help to raise this issue over at the libretro forums, as they're more likely to have insight into the nuts and bolts of this.

@allintospace most games on the psp suck on the pi. There are some older ones that run ok'ish.

@meleu Thanks! I appreciate the info

I was able to beat the guy without switching the controllers, so by the time I read this it was too late, but it may come in handy if I decide to do another run through!

@Rookervik WOW!!! FU@#$ING AMAZING!!! Thanks dude!!