Bug #395

Vulkan Tripple Buffering Stutter on GTX 1080 Ti FE / Ryzen 3600X [tested on 4 games]

Added by atari1980 about 2 months ago. Updated about 2 months ago.

Start date:
Cemu Version:
GPU Vendor/Model:
GTX 1080 Ti FE


After around 5-20 minutes of playing a game, the screen will become very jittery on 2D scrollings or when turning sharp turns in MK8.

No matter what game, demanding or low CPU load (Shovel Knight) it will happen.

FPS counter stays at a constant 60fps and between 16.5-16.6ms frametime while stuttering.

This issue is present on:

-All CEMU versions since 1.16.1 and as far back as nvidia's 441.66 driver.
-OpenGL is unafected and performance is great but has lots of graphical issues in Yoshi's Wooly World
-Double Buffering cures this but at the cost of a huge black bar that will inevitably appear at random and stay there

The issue is not present on (with nvidia's 451.67 Drivers) :

-Dolphin's Vulkan renderer (Mario Galaxy 1 / 2, New Super Mario Bros)
-Doom (2016)'s Vulkan renderer
-Red Dead Redemption 2's Vulkan renderer

Games Tested:

-Mario Kart 8 (best tested on Banana Cup, starts around the second/third race)
-New Super Mario Bros U (about 10 minutes in or around the 3rd stage)
-Yoshi's Wooly World (usually within 5 minutes)
-Shovel Knight (more or less after about 20 minutes or around when about to exit from the first village)

Fun fact: Testing MK8 without graphic pack seems to work fine, but if I set the graphic pack to 1280x720 it will start to do it, but a little later than at 4K

Here are what other things I tested:

-Brand new Gigabyte AORUS B550 Motherboard (F3 Bios)
-Asus Prime X470-Pro Motherboard (5601 Bios)
-CEMU v1.20.1, v1.20.0, 1.19.1, 1.19.2, 1.19.3, and all the way back to 1.16.1, with/without Cemuhook, brand new Shader Cache each time.
-Nvidia's GPU drivers with/without Threaded optimizations, Tripple Buffering, Prefer maximum performance
-CEMU.EXE enable / disable fullscreen optimizations / Override high DPI scaling behavior to application

Fresh Windows 10 1909 x64 installation:

Nvidia 441.66 GPU drivers
Visual C++ Redist (all-in-one found here:
DirectX web redist (

Fresh Windows 10 2004 x64 installation:

Nvidia 451.79 w/async enabled
Nvidia 451.67

Nothing I tried made it better or worse, note that my new motherboard is also boosting a lot higher than my previous one (4200 max vs 4350 3-4 cores very frequently)


Vulkan_MK8_Stutters.jpg (829 KB) Vulkan_MK8_Stutters.jpg atari1980, 08/05/2020 03:27 PM
1.20.1c_Vulkan_MK8_Stutters.txt (4.65 KB) 1.20.1c_Vulkan_MK8_Stutters.txt atari1980, 08/05/2020 03:27 PM
1.20.1c_Vulkan_Shovel_Stutters.jpg (1.24 MB) 1.20.1c_Vulkan_Shovel_Stutters.jpg atari1980, 08/05/2020 03:29 PM



Updated by atari1980 about 2 months ago

Forgot to mention, a graphic packs resolution of 1920x1080 to 3840x2160 does not help or worsen the situation. They exhibit the same behavior.


Updated by atari1980 about 2 months ago

Edit 2: I don't believe I am CPU-bound, as when the stutters happens, the games do not feel sluggish and are very responsive, it looks like a sync issue.


Updated by atari1980 about 2 months ago

Edit 3: New test: Setting MK8 to Tripple Core worsen the situation.

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