Comment 7 for bug 514410

I know this is an old bug but thought I would share some info. Not sure if it is related but this exact problem occurred with the last few releases of xubuntu and thunar. The problem is related to gvfs and the network automount. Every time thunar was opened for the first time (from desktop, panel, apps menu, anywhere) it would take 30 seconds or more to open. >After that it was fine until you logged in again and the first open would do it again.

The automount flag in the file /usr/share/gvfs/mounts/network.mount needed to be changed from 'true' to 'false'

AutoMount=true
to
AutoMount=false

It is talked about here https://wiki.archlinux.org/index.php/Thunar just a little over half way down the page under the heading "Solving problem with slow cold start"