KDE desktop freezing every minute for a second or two each time

Description

Note: it wasn't just the desktop itself freezing, but the entire screen, including any applications or games that were being played. Very annoying.

Solution

The cause was having the wallpaper set to Hunyango. Apparently that wallpaper required constant buffering or inefficient allocation every minute or so, since it was in a permanent loop. Reported the bug to KDE devs, so maybe this will get fixed, eventually.

X11 apps like Bisq having a very small font on Hi-resolution KDE desktop

Description

Some X11 apps have very small text font on them when running under the KDE Plasma desktop, and they will be incapable to scale well regardless of what settings you tweak. This can happen even with flatpak apps.

Solution

KDE Plasma offers a solution to this by under Display Configuration settings. Over there, you'll have an option of how to treat Legacy applications (X11). Under that setting, you have to manually choose "Scaled by the system". That will force the system to manually magnify the X11 applications automatically in the future.