Bad Performance with Dolphin 4.0.2 and Mario Kart

[admin89]

Make sure your CPU run at maximum turbo clock : 3.2GHz (4 cores active) . You can use throttlestop in the guide to enforce the CPU
Make sure you use the default HLE audio backend , not the demanding LLE
Use Realtemp to check CPU clockspeed and Nvidia Inspector to check GPU clockspeed when Mario Kart is running (It will be nice if you post some screenshots )
Btw , try Direct3D11 instead of OpenGL