As requested, results from running stock noble on the same Pi 4B with
the same SD card as before. First, stock noble (with all available
upgrades):

$ sudo hyperfine --warmup 1 -r 5 "update-initramfs -u"
Benchmark 1: update-initramfs -u
  Time (mean ± σ):     193.558 s ±  2.334 s    [User: 77.577 s, System: 118.253 
s]
  Range (min … max):   190.964 s … 196.165 s    5 runs

Second, noble after update from the specified PPA (ppa:bdrung/ppa):
 
$ sudo hyperfine --warmup 1 -r 5 "update-initramfs -u"
Benchmark 1: update-initramfs -u
  Time (mean ± σ):     81.116 s ±  2.468 s    [User: 16.125 s, System: 67.027 s]
  Range (min … max):   78.409 s … 84.017 s    5 runs

So a pretty substantial improvement :)

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

Title:
  performance regression in dracut-install 060

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