Wind Waker and a couple other Nintendo made games (Zelda, Mario, etc) use what's called zelda ucode for their sound, which is needed for certain parts of the game to run properly. Dolphin uses LLE to properly emulate this by using a DSP dump from the game (Dolphin comes with DSP that works). HLE doesn't 100% emulate zelda ucode. However, LLE is a lot more demanding than HLE.
Basically, HLE is faster than LLE, but you may run into some issues. If you do, use an in-game save toswitch back over to LLE to get past that part, and then switch back (don't use save-states)
Basically, HLE is faster than LLE, but you may run into some issues. If you do, use an in-game save toswitch back over to LLE to get past that part, and then switch back (don't use save-states)