Those KMS messages are due to MUTTER_DEBUG=kms which should not be set
by default. Do you have it in /etc/environment or /etc/environment.d/* ?
There's also a little bit of bug 2034664 in your log.
** Tags added: logspam
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2034722
Title:
High CPU usage causing slowdown
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