Hello,Thanks everyone for posting feedback.More benchmarking results are available at https://fedoraproject.org/wiki/Category:Changes/OptimizeSquashFS, including the 'plain' SquashFS filesystem.After performing the tests, I personally recommend to use xz compression with 1MiB block size, without bcj, on a 'plain' squash filesystem -- this will lead to a reduction of 142MiB on the ISO, compared to the stock Fedora 31 Workstation x86_64 image.Alternative compression options, such as Zstd, are also mentioned in the change proposal.