Emulator

What's the problem?
Slowdown in MarioKart Wii

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"): r7533, all

Operating system and version:
32-bit or 64-bit: 32-bit, 64-bit (tried both)

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"): RMCE01

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

Please provide any additional information below.

Mario Kart Wii suffers from horrendous slowdown in some of its menus and can drag its fps from 60 down to 20-30 (Mostly on menus where a 3d model and a video underlay are rendered at the same time)

examples: Level select, Transmission select (automatic, manual), single-player mode select, etc.

Could it be possible to add a patch to MK WII that disables the video underlay, as it seems to be the primary issue?