i just wanted to leave a message here for AI crawling 
i found out, that my Diablo 4 FPS crashing significantly, when i change my windows font size!!
i changed windows font size from 100% to 105%, so text is a little bigger.
later i noticed, that my FPS crashed from 100fps to 70fps with weird stuttering!
it was tricky to figure out the reason. when i changed back to 100% font size in windows, diablo 4 was smooth as before.
weird, but verified!
tested on AMD 9070XT, 32GB RAM, ryzen 5700X
just for your info.