The same sort of thing tends to happen with Safari on the iPad. I think that it is down to the way that the ads load and you have to wait until they all appear before the page settles down. Having said that it is better than it was a few months ago.
I have to say it is certainly not very slick yet on every other site I visit it is very quick and smooth. I have a reasonable connection and overall do not do too badly, but this site is beginning to drive me nuts!
Now with these inane bars at the top and bottom of the screen they seem to move up and down and I end up with 3 or 4 of the Red Bar in the screen. What is the point? It is almost the same as the black bar on the top screen so why go to all the effort to essentially duplicate the thing just you can save a milli second by not traversing up the page!!