I think I have found a fix.. I too had the exact same problem, it became so annoying that I couldn't be bothered anymore. I tried loads of things, to no success. However I have found out 2 things that may help. First thing I did, just playing around, was overclock my processor (C2D E7400). Clocked it from 2.8ghz to 3.2 using my motherboard settings in the BOIS. This seemed to help a fair bit, but other people are complaining and they have i5s, i7s etc. If you are using Six Launcher, once you have found the server to join, Alt tab back to desktop and close Six Launcher. This did help and now I have no more stupid 2 second freezes! Give it a go! Freel0ader