[Numerlor]

I did recently see someone compare mpv and vlc on a 8k HDR @ 60fps file with mpv really lagging while vlc doing it fine. I could confirm the mpv lags but don't have vlc, so not sure if it's just better in that specific case or did something like no actual HDR

[arch1t3cht]

This may just be because mpv has higher-quality default settings for scaling and tonemapping. Try mpv with profile=fast, maybe. To properly compare mpv's and VLC's performance you'd need to fully match all settings across both players.

[Numerlor]

It was with the fast profile using both software and hardware deciding, important detail I forgot was that the video was av1. Don't have the link to it now but it was from jellyfin's test files