FTP upload on save was incredibly slow for me (15-20 sec after save, upload bar sitting there, no indication why), which was really impeding my productivity.  I finally discovered the culprit which was the "Reload Browser on Save" checkbox in Project Properties > Browser.  I had forgotten that it was checked, and I wasn't even running the browser specified in the dropdown, but NB was apparently still trying to update it (possibly running a loop with a timeout and failing to find the process running on my machine?).

This may or may not constitute a bug, but I wanted to log it here so that others who are feeling the same pain I was experiencing can check to see if this is the culprit for them as well.  I've listed this as an enhancement, since it would have been very helpful if my output log had listed that it was trying to reload my browser, so I could see what was causing the delay.  After disabling that feature, uploads are now so fast there's not even a progress bar, which is ideal.

Thanks!