Great, thanks. That shows one CPU core is busy with "software
interrupts". And both Xorg and top are very busy...

I would guess most likely it's a faulty peripheral
(mouse/keyboard/wireless receiver) that's causing an event flood, so try
removing all of them and reintroducing them one at a time.

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https://bugs.launchpad.net/bugs/1944542

Title:
  [Lenovo IdeaPad 5 15IIL05] very slow

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