The projects Tab will display the contents of the directory you specify for your local projects in preferences. If your projects are directed to a network location or to a folder which contain hundreds of sub-folders, this can cause it to be slow. You could open Worksheet, go to Tools, Preferences, and test if you change your local projects to a different location, if it then is faster. If it is, take a close look at the amount of folders and files kept in the projects folder. You may need to re-organize the contents.