Bug 488825

Summary:	Performance regression in gaming after upgrading from 6.0 to 6.1
Product:	[Plasma] kwin	Reporter:	A1RM4X <A1RM4X>
Component:	performance	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	xaver.hugl
Priority:	NOR
Version First Reported In:	6.1.0
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description A1RM4X 2024-06-20 20:54:22 UTC

SUMMARY

Regression performance in benchmarks (Shadow of the Tomb Raider native Linux and Cyberpunk 77 via proton) while using Wayland: around 8 to 10% after upgrading to plasma 6.1.

Those 2 benchs were on par with X11 on Plasma 6.0, now they are 10% slower...

STEPS TO REPRODUCE
1. Bench SOTB on Wayland Plasma 6.1: ~275 fps
2. Bench SOTB on Wayland Plasma 6.0: ~300 fps
3. Bench SOTB on x11 Plasma 6.1: ~300 fps

STEPS EXECUTED TO MITIGATE THE PERFORMANCE LOSS:
1. Disabled Triple buffering via env variable ( KWIN_DRM_DISABLE_TRIPLE_BUFFERING=1 ) and reboot => Performance issue still here 
2. Disabled screen tearing in Display settings => Performance issue still here 
3. Disabled ICC color settings => Performance issue still here 
4. Switched to a different kernel version => Performance issue still here 

SOFTWARE/OS VERSION
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1

ADDITIONAL INFORMATION
CPU 5950x 
GPU RTX 4090 
Nvidia Beta 555 Drivers 555.52.04
Kernel 6.9.5-1-cachyos-bore

Comment 1 Zamundaaa 2024-06-20 21:14:33 UTC

Can you observe the same with NVidia driver 550? This sounds like a regression caused by explicit sync

Comment 2 A1RM4X 2024-06-20 21:25:13 UTC

(In reply to Zamundaaa from comment #1)
> Can you observe the same with NVidia driver 550? This sounds like a
> regression caused by explicit sync

Good call. I should have written in the bug report that I used a patched version of kwin which included the explicit sync patch.

Comment 3 Bug Janitor Service 2024-07-05 03:47:31 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 4 A1RM4X 2024-07-13 15:44:10 UTC

So I upgraded to the latest stable nvidia drivers and the regression performance is still there...

I am willing to share more info please advice.

Thanks

Comment 5 Albert Astals Cid 2024-07-21 19:42:58 UTC

Back to reported since answer for the requested information was given

Comment 6 Zamundaaa 2025-10-17 12:21:04 UTC

Do you still see this performance drop in Plasma 6.4 and with latest NVidia drivers? Specifically with the color profile set to "none", no HDR and the game in fullscreen?

Comment 7 A1RM4X 2025-10-18 18:41:48 UTC

(In reply to Zamundaaa from comment #6)
> Do you still see this performance drop in Plasma 6.4 and with latest NVidia
> drivers? Specifically with the color profile set to "none", no HDR and the
> game in fullscreen?

Hey,

Just redid the tests: no difference (margin of error) between x11 and wayland on KDE Plasma 6.4.5. I used the 580.95.05 Nvidia drivers with the open blob.

The data:
X11 / SOTR: 341 fps AVG
Wayland / SOTR: 347 fps AVG

X11 / CP77:  205 / 172  (AVG / Min)
Wayland / CP77: 203 / 173

Hope this helps.

Comment 8 Zamundaaa 2025-10-19 11:55:19 UTC

Cool