Created attachment 185613 [details]
An annotated screenshot showing the row of icons I was sliding the mouse cursor across

SUMMARY

On a lower end machine (Raspberry Pi 5) the Icons-Only Task Manager's performance when hovering the icons seems surprisingly poor. When just moving the mouse over the icons slowly, left to right and back, there is extreme lag for the popups for each program, to the point where the entire hardware mouse cursor lags and briefly gets stuck.

Now you would think this is because of the previews or something, but it doesn't seem to be: I disabled all previews, all media controls, all bringing windows to the front, basically everything except a basic text popup that simply says the program name and lists the amount of windows with zero visual details.

Yet, the extremely bad performance remains. I feel like on a 1.5Ghz+ machine, no matter how low end that is nowadays, showing a simple text popup when hovering a small list of icons shouldn't possibly take that much effort.

Therefore, it seems like something isn't working correctly here. My apologies if somehow this is intended and the expected performance.

STEPS TO REPRODUCE

1. Go into the icons-only settings and disable everything that could possibly be slow
2. Use a slow-ish low end machine like a Raspberry Pi 5
3. Simply hover the mouse over the icons going left to right and back, and watch the popups lag surprisingly.

OBSERVED RESULT

Unexplained pretty noticeable and bad lag. The web browser itself that I'm using here to type has no stutter problems, so it's not a general system issue I don't think.

EXPECTED RESULT

Popups show up with no delay and mouse cursor doesn't stutter.

SOFTWARE/OS VERSIONS

Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: pmOS Edge based on Alpine Edge
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2

ADDITIONAL INFORMATION

This is a low end Raspberry Pi 5. However, the browser is smooth.