Wind waker random lag in combat

Hey! I just started playing the Wind Waker on my dolphin emulator and I get huge drops in frame-rate when I enter combat (with some but not all NPCs). Another thread suggests using HLE instead of LLE but Wind Waker automatically changes it back to LLE when I start the game. I don't know how to get around this or if this is even a solution to the lag. Any help would be greatly appreciated. Thank you!