Emulator

What's the problem?
When you play through the first mission in StarFox Assault, you might notice it starts off quite speedy, then steadily slows down. I figured the cause was the Auto framelimiter figuring out the framerate the game wanted to run at. So I tried setting it to 60 instead and checking the box that says "Use FPS for Limiting"

This is where it starts doing weird things. The framerate (FPS) is still garbage, it's no better. The VPS on the other hand starts skyrocketing until the speed percentage goes up to like 2000%, but the game itself isn't running any faster. It's the same if you have framelimiter set to "off," and I don't know if this stems from another issue or is a duplicate or anything.

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"):
r6601

(optional) Dolphin version that does not have the problem:
Hell if I know

Operating system and version: WinXP x86
32-bit or 64-bit: 32-bit

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):
GF7E01
STAR FOX: ASSAULT (NTSC)

Was the ISO a plain dump from disc, compressed and/or scrubbed?
Plain dump

Please provide any additional information below.
I believe usually VPS controls game speed regardless of VPS. Guess that isn't the case for SFA.