Bug 419760 - frame rate drops if blur and transparency effects are enabled, blur background is enabled in Konsole and Konsole window is maximized
Summary: frame rate drops if blur and transparency effects are enabled, blur backgroun...
Status: RESOLVED LATER
Alias: None
Product: kwin
Classification: Plasma
Component: wayland-generic (other bugs)
Version First Reported In: 5.18.4
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
: 423609 (view as bug list)
Depends on:
Blocks:
 
Reported: 2020-04-06 20:30 UTC by Patrick Silva
Modified: 2023-01-17 13:51 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
frame rate when Konsole is not maximized (2.40 MB, image/png)
2020-04-06 20:30 UTC, Patrick Silva 		Details
frame rate when Konsole is maximized (2.17 MB, image/png)
2020-04-06 20:32 UTC, Patrick Silva 		Details
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Description Patrick Silva 2020-04-06 20:30:47 UTC 
Created attachment 127335 [details]
frame rate when Konsole is not maximized

SUMMARY
This issue affects both X11 and Wayland sessions.
On X11, frame rate drops from 60 to 45 fps, on Wayland from 60 to 30 fps.

STEPS TO REPRODUCE
1. enable transparency and blur effects
2. enable blur in Konsole settings (right-click > edit current profile > "appearance" section.
Click on "Edit" button, check "Blur background", click "Ok" button, click on "Ok" button again
3.  maximize Konsole window

OBSERVED RESULT
frame rate drops. Compare the screenshots taken on Wayland when Konsole is not maximized and when it is maximized.

EXPECTED RESULT
frame rate should not drop after the steps above

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.15.0 beta3
Comment 1 Patrick Silva 2020-04-06 20:32:25 UTC 
Created attachment 127336 [details]
frame rate when Konsole is maximized
Comment 2 David Edmundson 2021-07-09 06:05:32 UTC 
*** Bug 423609 has been marked as a duplicate of this bug. ***
Comment 3 David Edmundson 2023-01-17 13:51:21 UTC 
>on Wayland from 60 to 30 fps.

Changing the latency policy will fix this, to go to the same 45. This is part of a bigger problem that we aim to address properly, in the meantime the default has been changed.