xemu
xemu copied to clipboard
xemu-project
Vulkan: Performance Improvements
Bug Description
(NOTE: This issue is not an actual bug but just as a way to collect data for reference.)
The Vulkan backend more or less is comparable to the OpenGL one aside from a few visual issues and some titles that perform significantly worse at native resolution. However, sometimes the Vulkan backend can help titles that perform bad at native resolution even on OpenGL perform perfectly at resolutions even above native. Vulkan for the most part can also help titles perform better at higher internal resolutions than they would have if they ran on the OpenGL backend.
These are the current games confirmed that had performance issues under OpenGL at native that work at fullspeed on Vulkan:
Phantasy Star Online Episode I & II (MS-074 [4d53004a]) Silent Scope Complete (KN-026 [4b4e001a]) (affects both Silent Scope 1 and 3, 2 doesn't boot) Tim Burton's The Nightmare Before Christmas: Oogie's Revenge (BV-004 [42560004])
Currently, if you'd like to contribute to the list of games, look for games that already performed worse on OpenGL at native resolution that perform significantly better on Vulkan.
Expected Behavior
At worse, every title should perform the same as the OpenGL backend for parity's sake. Otherwise, performance improvements would be even better.
xemu Version
Version: 0.8.49 Branch: master Commit: 2cc926588b9fea2aa5bd5b4882cb7440c6553991 Date: Fri Apr 11 11:25:25 UTC 2025
System Information
CPU: AMD Ryzen 7 5800X 8-Core Processor
OS Platform: Windows
OS Version: 22H2
Manufacturer: NVIDIA Corporation
GPU Model: NVIDIA GeForce RTX 3080/PCIe/SSE2
Driver: 4.0.0 NVIDIA 572.83
Shader: 4.00 NVIDIA via Cg compiler
Additional Context
(NOTE: All comparisons are taken around the beginning of each game and can be gotten to by just starting a new game and playing a bit).
Comparisons:
Phantasy Star Online Episode I & II (MS-074 [4d53004a]):
OpenGL:
Vulkan:
Silent Scope Complete (KN-026 [4b4e001a]):
OpenGL (1):
Vulkan (1):
OpenGL (3):
Vulkan (3):
Tim Burton's The Nightmare Before Christmas: Oogie's Revenge (BV-004 [42560004]):
OpenGL:
Vulkan:
The Chronicles of Narnia: The Lion, the Witch and the Wardrobe Opengl 41ms
Vulkan 6-13ms
Dead or alive 2 map (The burai zenin) Opengl
Vulkan
Just a reminder that the performance is worse in both OpenGL and Vulkan once a fight loads on the stage, in this case Burai Zenin. The two added characters, especially if female with transparency (Kasumi and Ayane), can lower BZ to 10-15 in OpenGL and 30-45 in Vulkan.
@ehw Seem like most performace improvment in vulkan just come down to performace regressions in opengl from either 0.7.9 or 0.8.54 only LMA Manager 2006 seem to acual improvement but need retest once the regression have been fixed
Note: Phantasy Star Online Episode I & II and Tim Burton's The Nightmare Before Christmas: Oogie's Revenge Opengl Issues no longer occur on latest build.