Emulator

What steps will reproduce the problem?
1.Load Wave Race: Blue Storm with Load Native Mipmaps enabled and enter a race.
2. Disable "Load Native Mipmaps"
3. The Speed will be back to normal.

Dolphin version with the problem? Other Dolphin version without the
problem?

r6660 and 6686 have this slowdowns, but 6570 didn't

32-bit or 64-bit and any other build parameters?

64bit

OS version?

Windows 7 64bit

Please provide any additional information below.

I'm not sure if this is a defect, but since this didn't happen on old revisions I'm reporting. This seems to be affecting Super Mario Sunshine too, but the slowdown is smaller and this is probably normal, since SMS uses Native Mipmaps, and Wave Race doesnt seems to.