PCSX ReARMed has a feature called "Dynamic Recompiler" / dynarec that can be enabled for a framerate boost even though it is known to make certain games incompatible or buggy. Unfortunately, on libretro, the dynamic recompiler is enabled by default which results in some of the game not even started. Tony Hawks Pro Skater 2, for example, will not even load and will just display a black screen if "Dynamic Recompiler" is enabled.