> 1. Is the high CPU usage sustained when you're not doing anything?

No.

> 2. Is the CPU usage only when using a mouse, or does it also occur
when using a keyboard?

In both cases.  For example, Xorg's CPU usage jumps to 85% on my machine
when I continuously switch once per second from one terminal window to
another, regardless of the means (mouse or ALT+TAB).

On the other hand, merely typing (albeit fast) into a terminal window
leads to a much lesser usage by Xorg (around 10%).

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https://bugs.launchpad.net/bugs/1879042

Title:
  [radeon] Xorg high CPU usage and stuttering on ubuntu 20.04

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