cd power: well I *don't* clear the cache, neither automatically nor manually, and I don't have issues. So I think it's not the cache.
What I sometimes see is delays in DNS resolving or in the hops - to verify that, open a CMD window (Start/Run/ type 'CMD'), and enter there "tracert www.brainking.com". You can then see which servers you hop along until you get there. If the shown delays in milliseconds suddenly jump up, you see the server that is the issue. (nothing you can do about it though).
Also, try to connect to http://81.91.83.6 (the server IP from the last line in the list - type/copy it in your browser) instead to www.brainking.com. This avoids speed issues with your DNS, which are quite common. The only disadvantage is that when Fencer moves the server, the number becomes invalid