You may not have looked at all my sites 
However, I have noticed the same thing using the webpageoptimizer tool at:
http://www.websiteoptimization.com/services/analyze/index.html
So, I am quite sure it isn’t my connection… Besides, I have quite the large connection here and have rarely seen bandwidth problems.
Maybe 1 out of 20 is not the case now… When I was creating screens about 1-2 months ago, I would see it quite often (at about that rate). I really haven’t noticed a slowdown lately because I am not really looking at my sites that often (I know what they look like )
kw