The "Timer hack" feature is very buggy.

[[Unknown]]

Then don't use it. The timer hack reports skewed time to the game (although not as a full picture.) A few games, like Wipeout, start frameskipping internally when they see time moving faster than they expect. So it lowers the FPS of games (if it works) to make them more playable. It definitely does not work with all games and can break many. It's a hack after all.

When games frameskip internally, it is much more efficient than PPSSPP's frameskipping, because they can skip other work PPSSPP doesn't know about. But generally this option is a dangerous speedhack.

-[Unknown]