The Directories->Show SubDirs->Show Dir Size menu item sets an option to sum each directory as it is scanned into a Files window. This may take considerable time to sum directories on the drive, hence it is an option. The recommended way is to set this option on, then set it off if scans are taking too long.
When determining the size of a directory, the file size of all files in the directory must be individually retrieved and summed. No filter is used. The greater the number of files in a directory, the greater the sum time. Generally, the process does not take an objectionable amount of time but it may be undesirable to use this feature on low performance systems.
If enabled, the Details view Size column will include the byte size of each directory displayed.
Accelerator Keys - None