I guess you already have a few, but here's one more 
Here's a wireshark capture of the forum mainpage reload; upon first glance I find it odd that the first connection attempt just times out after 3 seconds and only then the connections get served.
Code:
1 <1 ms <1 ms <1 ms 192.168.0.1
2 * * * Request timed out.
3 16 ms 10 ms 10 ms ip-86-49-0-217.net.upcbroadband.cz [86.49.0.217]
4 11 ms 12 ms 12 ms 84.116.222.198
5 10 ms 12 ms 24 ms 84.116.222.193
6 10 ms 9 ms 9 ms 84.116.222.189
7 12 ms 9 ms 12 ms 84.116.222.185
8 10 ms 19 ms 34 ms 213.46.180.10
9 28 ms 24 ms 24 ms eth2-7.r1.fra1.de.atrato.net [78.152.44.14]
10 40 ms 47 ms 38 ms eth10-5.core1.ams2.nl.atrato.net [80.94.64.221]
11 44 ms 44 ms 210 ms eth2-5.edge1.ams5.nl.atrato.net [78.152.44.133]
12 42 ms 36 ms 45 ms eth2-4.edge1.rtd1.nl.atrato.net [78.152.44.32]
13 35 ms 38 ms 37 ms rijndata-42755-gw.ztm1.nl.as5580.net [78.152.32.182]
14 38 ms 41 ms 38 ms rtr01.zmr001.dict.nl [46.21.175.34]
15 43 ms 38 ms 38 ms 46.21.172.157Here's a wireshark capture of the forum mainpage reload; upon first glance I find it odd that the first connection attempt just times out after 3 seconds and only then the connections get served.