I have never tried it without the demensions so I am going to try it now to see if there is a difference in the size. Here goes.
It looks the same to me.
If I recall what was said by Jim Rob was that without demensions it takes way long for those on dial up to read the postings as it is taking forever to load a picture that does not have demensions on it. I remember that was the way it was for me before I got broadband.