Spoiler:
Desktop environment: KDE default, probably Plasma.
Antialiasing/hinting I tried all possible configurations - it didn't get better, only worse. If you enable hinting, the font becomes even less readable.
Now I set the KDE fonts in the settings - DPI = 104. I will not say what has become good, but at least somehow you can work.
#xdpyinfo | grep -B2 resolution
screen #0:
dimensions: 1680x1050 pixels
resolution: 96x96 dots per inch
Spoiler: