Try this, it appears to be helping me, http://twigstechtips.blogspot.com/2013/02/sublime-...
even though it talks about a different network issue, it seems to have improved performance.

remedy this by going to:

• Preferences
• Settings - User
• Add in this line

"ignore_inodes": true
Save and restart ST2. The subfolders SHOULD show up. If not, remove the folder from your project and add them again.

yeah I've got a project mapped to show local source, build server folder, and deployed code, but only local source is remotely responsive speedwise. if I open the same folder(s) in windows explorers it's instant.