[CEMU] MK8 SplitScreen has WAY too many visual glitches

Try switching between OpenGL and Vulkan.

 

That's normal. Look for pre-made shader packs for the games you want to play, otherwise you will have a lot of lag/stuttering/microfreezes on the first "play through" as it needs to compile every shader and there's thousands scattered across the entire game.

 

Intel GPU: Limited support. Vulkan is recommended

(From CEMU main page)

 

You need the right type of shaders. The newer type that is universal (it still needs to be compiled a final time for your specific GPU, but you can simply set it to pre-compile all of those before starting the game in the settings)
The older type was GPU specific, Cemu version specific, and generally had to be completely rebuilt any time you changed anything.
You can tell by the folder name which type it is, but anyway, I would just look for the most recently uploaded pack you can find.
If you set it to precompile the shaders (only works if you are using a shader pack with "intermediate" shaders like mentioned and does nothing for shaders that haven't been extracted from the game yet or need to be updated because of some changes in Cemu or in a game update) then before the game starting up you'll get a loading bar with Compiling shaders xxxx/xxxxx and it will take a few minutes the first time, but should be fast after that. Precompiling them this way saves the emulator having to do it when they're first loaded and pausing the emulation every time.

 

Well, because you are using Intel graphics, the shader compilation might just be that slow, even the few shaders that will need recompiling once loaded in the game (there are always some, the shader packs aren't perfect or completely up to date) will slow everything down to a crawl. Don't think you can do much about it, it's just a rather demanding system to emulate.

 

I play MK8 all the time split screen 60fps. ZERO visual glitches. Not ever. I play ona NVIDA Vulkan, async, 4K + Visual Mods.

Every game I play works so much better on VULKAN. YUZU is the same. OPENGL stutters so much. Not playable for me.