Not surprised. Maybe its good to bring it to the surface for the newcomers. I've only been a member of the forum for a few months and had not run across it. Possibly a search for "test utilities"...

Found this to be very useful so I thought I'd share.

http://www.thesycon.de/eng/latency_check.shtml

Informative site and the utility is free. Here is a general overview from the site.
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Enough said.

One way to look at it is to consider that when you "tune" a system using pink noise, program material, etc, you are attempting to set the PA to reproduce your reference material as linear as...