[barrkel]

Decompression is more often limited by disk I/O, in my experience, particularly when the source and destination are the same disk. I can often get large improvements in decompression and installation speed by putting the source file and / or temporary installation files on a different disk.

[alecco]

It's not always I/O speed. You can notice when installing CPU usage goes to 100% (or fans kicking in) for BWT/LZM* and not for the DEFLATE (unless you use -9 or something like that.) While you install something at least one of your cores is unavailable for anything else.

This affects energy consumption, too.

And think about both mobile and servers. Those systems are usually more sensible to high CPU load.

I have a draft blog post with analysis of different protocols with valgrind and other tools. But it is so much data to present and graph I never get around to finish it :(