Just installed this and (combined with xwayland 24.1) it fixes the grand majority of the xwayland issues. I assume they'll be totally gone when the kwin version with explicit sync drops.
I've seen a 5% decrease in game performance and a game crashed on me for the first time in forever after installing it, so you might want to wait for stable though
I tried Fedora KDE 40, it was hell to install the Nvidia drivers and it freezes randomly and when I play the screen goes black after some minutes and I have to restart.