I am having a consistent high CPU usage by the Budgie desktop environment running on Solus, often reaching 350%+ CPU on a single process, in addition to up to 20% on other 16, according to htop. Rarely, it would hit 600% and 55% CPU usage on those same processes.
The tested kernels were 4.9.22-17.lts and 4.12 (linux-current today), while the 4.9 was also tested on a fresh OS installation.
The ~/.xsession-errors file was empty.
I am attatching my sudo journalctl -a output:
and lastly, my pstree:
This is my system:
Here is a screenshot of htop:
It looks like having a browser open, be it Firefox or Google Chrome, has a big impact on this cpu usage, as it instantly goes from 200% CPU to 350% as soon as I open them. The same can be observed with multimedia software such as playing a video on MPV.
Having Gnome MPV idle (as in no video file open) seems to have no impact on the cpu usage of the environment.
The lowest CPU usage (95~100%) happens with no multimedia capable applications running, no streaming or media players of any kind.