You aren't using LLE audio are you (the recompiler or the interpreter in the DSP settings) are you? You should just use HLE audio (the first option). If I recall correctly, the Harry Potter GC games are actually very demanding on the CPU. 3.3GHz isn't enough. We still need your exact model (yes, it can make all the difference between not being able to run some games fullspeed or not). Use a program called CPU-Z and post a screenshot of the info it shows.
At any rate, please do not use 4.0. It's one of the slowest versions of Dolphin out there, probably. Use the latest development revisions here (the 4.0-19XX builds) : https://dolphin-emu.org/download
The newest builds should be faster than 4.0. See if that helps at all.
At any rate, please do not use 4.0. It's one of the slowest versions of Dolphin out there, probably. Use the latest development revisions here (the 4.0-19XX builds) : https://dolphin-emu.org/download
The newest builds should be faster than 4.0. See if that helps at all.