TCP_HIT vs TCP_MEM_HIT speed.

I apologize if this has been asked before here, I havn't been on the list
and I couldn't find the answer in an archive search.

I'm using Calamaris 2.27 on a small (500megs, on a P5 Linux box) Version
2.2.STABLE5 Squid. As always, Squid performs wonderfully.

Looking at my Calamaris output I see:

     TCP_HIT 10383 25.25 48853 26.84 0 97.95
     TCP_MEM_HIT 653 1.59 1395 0.77 0 46.21

It kind of puzzles me that MEM_HIT is slower the TCP_HIT, as I though that
MEM_HITs were hot objects and the others were off disk?

Do I have something out of tune, or is Calamaris confusing me?

[Please CC me on replyes because I won't be subscribed for long]

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