The boot time slowness looks related to hardware errors on the boot
drive:
Jun 12 22:55:56 ee-Z790-Steel-Legend-WiFi smartd[2365]: Device: /dev/nvme0,
KINGSTON SKC3000S1024G, S/N:50026B7686280109, FW:EIFK31.6, 1.02 TB
...
Jun 12 22:55:58 ee-Z790-Steel-Legend-WiFi smartd[2365]: Device: /dev/nvme0,
NVMe error count increased from 4268 to 4271 (0 new, 2 ignored, 1 unknown)
The run time slowness looks related to rendering load, which is probably
due to Firefox:
PID %CPU COMMAND
3520 25.8 Xorg
6987 4.5 firefox-bin
6287 3.2 cinnamon
but also the failing Kingston NVMe drive can make runtime slow too. This
would make the installed system slow, but live sessions would remain
fast because they don't touch the failing drive.
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https://bugs.launchpad.net/bugs/2068804
Title:
very very very slow even though a quite well system
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