Animal Crossing City Folk - 60fps, down to 30fps

[ForumsLP]

I started using Dolphin last summer. I had onboard graphics of HD 3300 on Windows XP Pro 32 bit with a 3-core Processsor, AMD Phendom II. Since then I have upgraded to Windows 7 Pro, and HD 5850. I run Animal Crossing, but after 5 minutes of 60 fps running smoothly, it bogs down to 30 fps, and I do not know why. I tried running just my HD 3300 graphics on it with 7, it didn't make a difference. I tried r6000, and r6505, both with less performance or same. The game ran smoothly in the summer, but I have long since then lost the emulator. How can I fix this problem? Is there a specific revision I should use for this game? I also would like netplay.