Hello,
first, thanks for all the help, i couldn't answer before..
I started having a problem with the "Twitch" addon for kodi, I went into git to see other people's reports, I saw a thread about raspberry pi 4, and it said that to use Kodi with twitch, I should disable DRM . After disabling I saw that the performance improved on 1080p 60fps videos. The 2160p videos are opening but are slow. The jellyfish videos that didn't run before are opening, but also slow...
Now which way, try to solve the problem rom the DRM enabled or disabled? I'm thinking of starting a fresh install using your modified aarch, what do you think?
Regards