Maximum number of files under a directory (Solaris)

- Is there a limit to the number of files under a directory on Solaris OS?
- In fact, there is no such limit. But it is not a good situation if there are thousands of files under a directory. Because, operations like finding, opening, creating and deleting a file are affected as the number of files goes into tens of thousands.
(http://www.sun.com/bigadmin/xperts/sessions/20_jes/#8)