@viraniac well, you're absolutely right! Same SD card with a fresh noble
install, running on a Pi 4, first stock and second with a downgraded
dracut from mantic:

Pi 4B, stock -- 03:05
Pi 4B, downgrade -- 01:10

That is a pretty substantial regression, and diff'ing the initrds once
more showed they're basically identical in content (unsurprisingly), so
it's not writing any less. I wonder if it's added some sync points or
something similar.

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https://bugs.launchpad.net/bugs/2065180

Title:
  performance regression in dracut-install

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