A somewhat faster alternative to is_dir and is_file?

Howdy, I've written some, kinda coolish, class that reads directories recursively with some simple calls. Yihaaa, .. (but I'm not the only one who has done that, I guess :P). Anyway, during the process of traversing a directory it checks to see if the "something" that was found is either a directory or a file, based on that it will do some things. Fine, works. But, now that I've got a directory with about 800 files to read I noticed that it takes the poor script almost two seconds to find the correct type of all the "somethings". In fact, I timed it on a steady 1.71. I've tried to use filetype() on the "something", but that took even longer - while looping through the directory without any checks finishes in 0.01 seconds. Now, for the question: does anybody know an alternative method on checking whether a "something" is either file or directory? Wouter (this time, I'm on a Windows XP machine running PHP5 - just tested the same thing on Linux and PHP 4.3.8 and came out on 0.63 secs, ..)