Comment by pmontra

Sshfs sets the nodelay tcp flag to off by default precisely because it's designed to transfer files and not interactive traffic, that is single keystrokes in a terminal.

This thread from 2006 could be interesting. It's about the different performances of scp and sftp https://openssh-unix-dev.mindrot.narkive.com/proARDEN/sftp-p...

Meta: the negative in nodelay makes it hard to follow some comments sometimes because of double negatives. The general best practice is to refrain from using negatives in names. This might have been TCP_GROUP_PACKETS?