Web Developer from Omaha, NE
Ever since upgrading to Mavericks, Finder would get hung up opening a folder through the Open/Save/Export dialog box. Everything was still responsive but all I got was a progress spinner when clicking on a folder, no files. After 5-10 seconds every thing catches up and all folders and files are again available. That 5-10 seconds was driving me crazy though.
According to OS X Daily it’s caused by the Finder attempting to mount network drives. They have a easy to follow step by step on how to fix the bug which worked perfectly for me. You will need to fire up the Terminal to get this one done though.