Should it be so slow in Radxa Zero 3W (RK3566)

It is my understanding that Ubuntu 24.04 LTS (with Rockchip Linux 6.1) should not be that slow on Radxa zero 3w RK3566RK3566.

I tried Radxa original Linux with KDE is was pretty decent, no too much lagging in UI.
Youtube/Browser video acceleration does not support. But what is wrong with Joshua' Linux?
Get i  get it a bit faster?


