ergophobe - 3:47 am on Feb 12, 2010 (gmt 0)
Yeah exactly. There are some functions in PHP that seem to behave differently in Windows and Linux because they depend on native *nix functions, but even between very different setups, it's still really useful.
If you mirror the OS, server, PHP + MySQL versions, even if the hardware is quite different, it gives a very good relative sense of what's eating up CPU cycles.
Pretty amazing the sheer quantity of data it gives you and the ability to view it in so many different ways. I haven't actually fired it up in a while, but I have a slow Drupal site I've been thinking needs some profiling.