Sylvain Henry authored Feb 18, 2021 and Marge Bot committed Feb 27, 2021

Reduce XZ compression level for regular jobs (it is bumped to 9 for releases
and nightly jobs). In my experiments I've got the following bindist size in
the given time for each compression level (with the quick flavour):

  XZ_OPT        Time    Size
  -9            4m06s   112 MB
  -8            4m00s   114 MB
  -7            3m50s   116 MB
  -6 (default)  3m40s   118 MB
  -5            2m47s   123 MB
  -4            1m57s   134 MB
  -3            1m03s   129 MB
  -2            49.73s  136 MB
  -1            37.72s  142 MB
  -0            34.40s  156 MB