"Hmm, #KiCad pcb editor is awfully sluggish on this laptop."
"Oh right, this laptop has a bajillion pixels (288 DPI)"
*turns anti-aliasing down from "high-quality" to "fast"*
no more lag, no perceptible visual difference
actually, no perceptible difference if I turn the anti-aliasing totally off, unless I get my face right up to the screen