Apache :: Blocking / Slow On Local Windows-system

I have a website on a linux-server working fine with PHP/Apache. The page loads a lot of css/js/image-stuff (total 84 requests, 220k), it takes about 4 secs to load via internet.

Now I'm testing the same page locally on a Win7-64-system (Apache 2.2, PHP 5.4). The system is not very slow (8 GB RAM, SSD, i7-CPU), but loading the same page as above takes about 50 secs.

The Q is: What might be the problem?

- I turned off firewall and anti-virus.

- I used mod_status: 150 threads, max. 11 seems to be used during the loading of the page.

- I tried php5apache2_2.dll with TS-PHP 5.4 and mod_fcgid.so with NTS-PHP 5.4, but the loading-time kept almost the same.

Looking at the "network-tab" in FF or Chrome, I found that a lot of subqueries get a timing like this:

Blocking: 11.96 s
Sending: 0
Waiting: 1 ms
Receiving: 6ms

So the loss of time seem to be in the "blocking"-section. I first thought of something like "limited number of TCP-Connections", but as said above, on the same system the page is remotly loaded fast enough almost without these "blocking"-parts.