I am not sure this will make the install significantly faster. The
current naive implementation of pagecache-management may well make the
install slower as it forces each file to be written to disk before we
start writing the next file.  OTOH, I am sure it can make installs
significantly more responsive, as it may prevent GUI code being
continually swapped out. I have had cases of machines appearing to be
frozen, taking several seconds to respond to any input, during installs.

I was thinking of doing something like
  pagecache-management.sh time cp -r /rofs /target
Just to check that the policy wouldn't actively slow down the install.

-- 
Ubiquity should advise kernel to discard pages from copied files
https://bugs.launchpad.net/bugs/197579
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