Serious slowdown in Resident Evil 4

[JMC47]

DSP LLE hasn't been needed in GameCube games since late 3.5 days; and putting LLE on separate thread is just asking for trouble. It's very possible the game is doing something complicated with audio and the DSP alone is causing your slowdown; as I've seen happen in other games! Actually, I can pretty much guarantee DSP LLE on thread is slower if you're using a build where Cache Display Lists is still an option.