Enable or Disable File Size Information in Folder Tips
When you hover your mouse over any folder, you will see a balloon showing you the date created, size, and partial files list. Removing the Size can be useful for performance in some situations if you don't need to know the folder file size.
Following these easy steps will only show the date created when completed.
Check or uncheck Display file size information in folder tips.
Click OK.
Advanced users can find this setting in the registry also. Look for FolderContentsInfoTip located in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced.