Most of us had that problem when 8.1 came out. Luckily MiRai has all the info for us.
https://www.youtube.com/watch?v=hMdDurXgyhI
and maybe
https://www.dual-boxing.com/threads/...e-for-Azeroth)
For me, making sure triple buffering was disabled and graphics API set to DX11 Legacy had the biggest impact.
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