Okay, after trying again, I did notice some sort of 'freezing'.
Not freezing as in IE becomes unresponsive, but when I open msgpluslive.net and click on any link (e.g. news, download etc.) it says "waiting for msgpluslive.net" for a few seconds and the page is unresponsive in that time (can't scroll the page, can't click on anything).
Doesn't happen in Opera though and probably depends on your connection speed, I hardly notice it with my internet connection.
IE 7.0.5730.11