Not outright I imagine, since large parts of the game in either case are loaded into RAM and fed through the PSP's processor from it. The difference if any is probably less than negligible so as to make no discernible difference aside from initial load times, considering the game loads from somewhere other than the UMD in the case of custom firmwares.
However, custom firmwares facilitate cheating through a certain piece of homebrew software and codes that could yield all sorts of ugliness, like unlimited autopilot, etc. Very unfortunate but true.
- F





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