I have an SSHFS mount from a Ubuntu Server VM guest, mounting a host Mac OS X directory. Changes made directly in the Mac OS X host directory take approx 5 - 10 seconds to reflect in the Ubuntu Server VM guest mount.
I am using the following command...
sshfs user@host: ~/host
What additional options (if any) will improve this latency?
watch -n 1 'ls -l ~/host'
on the mount point and creating a directory or file in the host and seeing how long it takes to appear.