[squid-users] Very slow site via squid

I have a squid 2.7 setup on openWRT, running on a 400Mhz/64MB embedded
system.
First of all, a bit slow (which is another issue), but one site is
especially slow, when accessed via squid:

1408356096.498 25061 10.255.228.5 TCP_MISS/200 379 GET
http://dc73.s290.meetrics.net/bb-mx/submit? - DIRECT/78.46.90.182 image/gif
1408356103.801 46137 10.255.228.5 TCP_MISS/200 379 GET
http://dc73.s290.meetrics.net/bb-mx/submit? - DIRECT/78.46.90.182 image/gif

Digging deeper, (squid.conf: debug ALL,9) I see this:
2014/08/18 11:17:26| commConnectStart: FD 198, dc44.s290.meetrics.net:80
2014/08/18 11:18:00| fwdConnectDone: FD 198:
'http://dc44.s290.meetrics.net/bb-mx/submit?//oxNGf

which should explain the slowness.

Example of http-headers:

Cache-Control no-cache,no-store,must-revalidate
Content-Length 43
Content-Type image/gif
Date Mon, 18 Aug 2014 10:04:52 GMT
Expires Mon, 18 Aug 2014 10:04:51 GMT
Pragma no-cache
Server nginx
X-Cache MISS from my-embedded-proxy
X-Cache-Lookup MISS from my-embedded-proxy:3128
-------
Accept image/png,image/*;q=0.8,*/*;q=0.5
Accept-Encoding gzip, deflate
Accept-Language de,en-US;q=0.7,en;q=0.3
Connection keep-alive
Cookie id=721557E9-A0E0-C549-7D6A-B2D622DA4B1F
DNT 1
Host dc73.s290.meetrics.net
Referer http://www.spiegel.de/
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101
Firefox/31.0

I can only suspect something special regarding their DNS.
Any other idea ?

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