Low FPS performance on weaker hardware and Vulkan Api enable.

[fabioap-cpu]

I recompiled 4 games, such as Tekken 1, Tekken 3, etc.

But, strangely, on my PC the game runs perfectly, however on older hardware, like most people's, the games run with very low performance.

I think the problem is in the GPU code at the conversion level?

I haven't had much time to investigate this... I would appreciate it if you could confirm this.

And is it possible to reactivate the Vulkan API for Linux operating systems, etc.?

Thank you!

[mstan]

Hello!

If possible, some diagnostic information about the types of machines and operating system it's running on could help.

There's a multitude of areas this could be having issues. For instance, if the game is overlay heavy, it could be finding itself falling back to interpreter while it is compiling overlay shards if those aren't shipped with the game itself. Proton in particular can struggle here as the embedded tcc compiler may not want to play nice or pace well on older hardware or in a virtualized environment.

As for Vulkan, it is in the ecosystem but disabled at present. There's still some performance and correctness issues that need worked out. You can certainly enable it for your own games, but I would advise you be prepared to QA it and potentially build in some performance.

On that point, ensure your releases are using OpenGL and not the software renderer.

Hope this helps! Do let me know if you aren't sure on next steps and would like to discuss.

[fabioap-cpu]

Yes, when I created version 2.0 of my game recompiler, it crashed, but the performance improved compared to the previous version of PSXRecomp (I don't remember which one it was).

When I updated to the latest version of the PSXRecomp runtime, it stopped crashing, but performance on weaker hardware dropped to 19 FPS, or became slow in Tekken 3.

I noticed that in Soul Blade, the game runs faster than normal and has a strange hissing sound problem.

Could I send you a link to my recompiled games so you can analyze them?

My hardware is a Ryzen 7 5800x3D with an AMD Radeon RX 6800XT.

I'm using Windows 11 Pro 25h2 (Build 26200.8875).

And both games run fine for me with OpenGL, but not for others.

[mstan]

@TechnicallyComputers Going to tag you in on this one since it involves Tekken 3. I suspect the decrease in performance could be related to some of the rb engine and/or netplay work. May have us work this one together.

[TechnicallyComputers]

#253 = rewind off by default
RetroPortingToolKit/recomp-ui#38 = settings toggle in recomp-ui to turn rewind on/off.

This is going to be the lever if anything.

[fabioap-cpu]

Yes, I have absolutely no idea what's causing the problem.

Perhaps you could try recompiling, for example, Tekken 3 or another game and analyze the problem...

Whether with or without netplay, the problem persists.

[mstan]

Hello! As a follow up, I did a recent performance optimization on the ecosystem. Any title compiled against the later main/master should see around a 10% performance improvement under ideal circumstances.

If issues persist, let's get your hardware specifications and take it from there.

If you can compile a title against it that you know has issues, that's best. But if not, let me know if any of my titles (Tomba, Tomba 2, Ape Escape, Megaman X4/5/6 ) reproduce and I'll cut a new release targeting those.

[fabioap-cpu]

I tested Tomba 1 on my PC and the game ran perfectly. Unfortunately, I don't have a weaker PC to test it on... also, my recomps work without problems, it's just that they don't work on other users' PCs...

But I'm going to release Tekken 3 with this latest performance optimization to see the feedback...