On Pi4, there are a known problem with PPSSPP regarding freezes and lag ingame. PSX is optimized and works better. Check your roms.
@danilovertuan please upgrade to 7.0.1 this should fix your issue
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please dont up old topic.
Create below file and put in your command
Make it executable
chmod +x custom.sh
/recalbox/share/system/custom.sh (if exists) is ran at boot.
The files will be in the save directory. Try it and tell us if it works. If it does, open an issue and i will add that for fba_libretro only.