https://bugs.winehq.org/show_bug.cgi?id=50733
--- Comment #11 from Zebediah Figura z.figura12@gmail.com --- So 6.0 is dropping about as many frames, which makes it unfortunately difficult to tell what's going wrong.
Still, from examination, I've managed to find some serious issues with our QoS management, and I've submitted some fixes, committed as https://source.winehq.org/git/wine.git/commitdiff/d99912aa65d63973af64f130659ecc36cce82e0d. Please retest with current git or with 6.4 when it is released (scheduled for this Friday).