FolderSizes Search has the ability to search multiple local, mapped, and UNC file system paths in a single pass.
Use the New Path button to add as many paths you wish into the search paths list box. Select a search path and click the Delete button to remove it. Use the Edit button to modify the currently selected path. Use the Up and Down buttons to re-order entries in the search paths list box. FolderSizes will search them in the order you specify.
Select the Search Subfolders checkbox if you wish to have the search system recurse into subfolders.
There's also a switch that enables the resolution of file/folder ownership data for search results. Disabling this setting may result in a performance improvement when a large number of search results are being returned.