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This Week in Plasma: File Transfer Progress Graphs
(blogs.kde.org)
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The performance impact of these systems really aren't a problem for most modern computers. If your computer is running other GUI applications, I think worrying about that is insane. If you're running a server, sure keep it minimal because you aren't going to interact with it directly much. For your desktop if you're running games and stuff, it's going to be the smallest of your issues. Just do what feels best.
Even Valve, optimizing their handheld device for maximum battery life, includes KDE. You shouldn't worry about it probably.