https://bugs.kde.org/show_bug.cgi?id=426702

Clotta <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #1 from Clotta <[email protected]> ---
Operating System: KDE neon 5.21
KDE Plasma Version: 5.21.1
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-66-generic
OS Type: 64-bit
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 2600X Six-Core Processor
Memory: 47,1 GiB of RAM
Graphics Processor: GeForce GTX 1070 Ti/PCIe/SSE2

Before 5.21 compositor on OpenGL2 & OpenGL3 was slow and laggy, like in-game
low fps but without big jerks. Web-Page had issues with scrolling (was slow),
dragging windows was with delay, input was with delay, KDE main menu navigation
was with really big delay. 

With every native desktop notification PC performance became much worst and
slowest than before. But transparency and animations works ok, so composer
works. Because that I prefer to switch off composer property and working with
the pure gui. I had only one Issue with App's windows without composer. It was
that unexpectedly moving on top place after switching desktops. Even window has
no focus.

After 5.21 upgrade I got a lot of new issues with both modes: with composer and
without. So without composer I got new problem - browsers and some windows
starts caching render from previous stage. 
How it works:
- Open Firefox with static (!) page.
- Switch to another desktop.
- Go back to previous desktop with FF.

And now you can see that instead FF window here is a render from previous
desktop. Also browser caching windows that staying in front of browser's
window. So you can see dirt trace while moving windows in front of browser's
window. Next event that trigger rerender/repaint in browser erase this traces
and show browser's content.

That's the main issue while composer is disabled.

So, when composer enabled we have same problems that were in versions before
5.21 (laggs and slow) but much powerful. System is slovy and laggy, like never
before. So this mode is absolutely useless now for me.

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