Here’s a made up example. Suppose you have a choice between compressing a game:

• to 10 GiB, and it takes 2min to unpack it in a certain machine
• to 3 GiB, and it takes 8min to unpack it in a certain machine

The download size difference of 7 GiB only costs me another 60-80s to download as long as the Steam servers are serving well. So funny enough the first option would be better for me.