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I was wondering, when I look at the Request statistics - Bytes sent numbers. I have four cases:
a. Plain uncompressed document.
b. Gzfile (precompressed) document which is sent in gzipped form (obviously); this is the old style precompression of versions <10.0.
c. PHP output, uncompressed.
d. PHP output, gzipped by PHP before sending it out.

Now, the question is, for cases b and d, what does the monitor count as Bytes sent? I would hope the actual bytes sent (just the compressed ones); but looking at the stats it seems that it might be counting uncompressed size despite it being transmitted gzipped. Any insights?

The 'Bytes sent' counter shows how many actual bytes have been sent. That's response header plus response body. The format/type of the content is irrelevant.

Brilliant! Thanks.