I use ioA search for my 15000+ dirs on site. Search is fast when configured correctly. Don't make it search too deep when you only want dirnames at certain depth in dirstructure.
Code:
[12:41:45] [L] site search acrobat reader
[12:41:46] [L] 200--[Search]--------------------------------------------------------
[12:41:46] [L] 200-/apps/adobe/Adobe Acrobat Reader 6.0 - english
[12:41:46] [L] 200- 1 match to searchcriteria
[12:41:46] [L] 200------------------------------------------------------------[ioA]-
Code:
# Search_Path=d:\ioftpd\site\MP3|/MP3|1
# This will search MP3 dir and one dir down. Usually a dated dir
...
Search_Path=d:\ftp\apps|/apps|1
...
Well I have a couple of sub categories in apps dir. So ioA will search apps dir and dirs in those sub categories NOT inside every dir in subdirs. That takes time. IMO searching for files is not needed. I only allow search on dirnames.