I've discovered huge quantities of .TMP files under each user's Chrome Extension State File (<User>\AppData\Roaming\Google Chrome\User Data\Default\Extension State\). The files are named either LOG.old~RF*****.TMP or LOG.Current~RF*****.TMP. There are over 100,000 of these filed under each user profile. The file sizes are 0-1KB for a total file size of <10MB. However, when using Folder Redirection/Roaming Profiles this results in long log on times. I manually deleted these files and log on times went from ~10 min to <10 seconds. AdBlock Plus is the only extension installed so I believe that it is at fault. Dates on the tmp files range from 02/21/2014 to June.