Follow Naman's advice ... Multimedia's install requirements are greater than you're typical Dragonized or Manjaro KDE Plasma install requirements. Make sure you have enough RAM & disk space available before you attempt your install.
How do you know if the performance is the same as Manjaro on disk, if you can't install Garuda to disk?
Garuda Plasma is at 5.21. That hasn't landed in Manjaro yet. The latency recode in 5.21 is very noticable ... you just can't compare apples to oranges (disk vs USB stick).
I remember you well from my time using Manjaro, so nice to see you over here. You always struck me as a very competent and experienced Linux user. It will be nice to (hopefully) see you hanging out around here once your install issues are worked out.
Perhaps try booting to run level 3 via the Grub menu. Then try repeating what @petsam suggested once more.
Also please post:
The output of:
You can run and post this info from
your Manjaro install if you can't get it working from the Garuda live environment. It is also possible to post your inxi output directly from the terminal using "termbin" from Garuda's live environment.
You could always install one of the other Garuda KDE versions then customise it to it to your liking afterwards if you don't have much success working out your install bugs on the multimedia edition.
All the best, good luck, and again welcome to Garuda.