Something was killing my performance, especially in GTK3 apps like Meld and Firefox, and I think I finally figured out what it was.
If I set "Force Fonts DPI" to 192 in KDE and/or XFCE, then I get horrible lag.
If I leave that alone and instead pass "-dpi 192" to the X server (e.g. in kdmrc), then it's significantly less bad.
I'm still testing this, but it seems to be the case so far.
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