Regarding the previously reported slow down
when file sharing a large volume, one reader queries whether "the user might inadvertently be sharing every
file on their drive by checking the 'Share this volume' box for the large drive." If so, this might lead to the slow down. He also reminds readers of a standard technique for dealing with file-sharing problems: delete the invisible AppleShare PDS file (at the root level of your hard drive); it will get recreated (although you will have to reset your permissions) and might just fix the problem.