As assumed this really seems to be cross arch and for all sizes.
Here 16 PU, 128G on ppc64el:
  #1: 54 seconds
  #2: 7 seconds
  #3: 23 seconds

Upped to 192GB this has:
  #1: 75 seconds
  #2: 5 seconds
  #3: 23 seconds

As a note, in this case I checked there are ~7 seconds before it does
into this "single thread, kernel busy" load. Those 7 seconds might be
other/usual init in qemu/kvm while the long load is the

Just the linear scaling is what breaks it, in case the same speed
applies 10 times as much  +1.28TB would be in the 10 minutes as well.
The remaining difference might be dimm speed and bandwidth.

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https://bugs.launchpad.net/bugs/1838575

Title:
  passthrough devices cause >17min boot delay

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