Apache Benchmark vs Firebug "Waiting for Response"...

On a site I am developing, r-e-m-a-p.org, many requests take way too
long on "Waiting for Response" as shown on Firebug's Net panel (>
1s) .

The requests are mostly static images and some very small PHP scripts.
The php's always take at least half a second. The images are sometimes
very slow (>500ms), and sometimes very fast (<5ms).

At first, this seems like a problem on the server but Apache Benchmark
(ab) shows that the server is actually very fast. All requests are <
20ms even without keep-alive, and without concurrent downloads.

What could be the big difference between "Waiting for Response" and
ab? What is firefox doing that is counted there?

The Safari "resources" view shows the same slowness but also shows
that this is due to "latency" defined as the time between issuing the
request and retrieving the first byte. This is often >300ms.

The ping-time to the server is blazingly fast. Any ideas?

thanks,
Tomas

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