Massive Haruna's performance bottleneck

While media players like MPV and SMPlayer (that uses MPV) 4K60FPS videos can keep up effortlessly with any skip I make, Haruna (that uses MPV) simply can’t keep up, as shown in the video.

Is anyone else having this problem? And did the “seek 5 relative“ command fix everything in your end? It didn’t changed anything for me.

https://bugs.kde.org/attachment.cgi?id=188098

Still happens with the Arch-Based CachyOS Cachy-Update’d 5 minutes ago.