lr-pcsx-rearmed slow game with multitap

[gzuz]

Hello, i've set up a Pi 4 with retropie 4.8 from pre made sd image and official power supply. I want to use it for party games (6-8players) and first game i tried was micro machines v3 on pcsx. I set the multitap on 1&2 and saved the override - works fine. I then wanted to do it on Micro Maniacs. The game runs perfect for single player. Once i turn on Multitap it gets super slow if 1 multitap is on (1 or 2) and gets even slower with 1&2 on or even freezes. If i set it back to multitap off it runs fine again. Is there anything i can try? I get a message that a bios file may help to improve performance? Since the controller are all mapped and recognized when multitap is on they should work. With one multitap i was able to get 5 player into th vs. mode but its so laggy its unplayable. The lagging starts with the start of the game. The intro is in slowmo and sounds awful.

Pi Model or other hardware: PI4 - 4gb
Power Supply used: Official
RetroPie Version Used (eg 3.6, 3.8.1, 4.1 - do not write latest): 4.8
Built From: Pre made SD Image on RetroPie
USB Devices connected: 2x Data Frog PS2 Style , 2x geekpi2 snes controller
Controller used: mentioned above + 2x switch pro BT Controller
Error messages received: -
Verbose log (if relevant):
Guide used: (Mention if you followed a guide)
File: -
Emulator: (Name of emulator - if applicable) lr-pcsx-rearmed

[mitu]

@gzuz said in lr-pcsx-rearmed slow game with multitap:

I get a message that a bios file may help to improve performance?

Using a BIOS file is always recommended. Try adding one of the supported
BIOS files and see if performance improves.

[gzuz]

@mitu it worked just fine after adding a bios. Thank you!