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If the site isn't yours it's a little tricky. You need to save the page including all images and then grab any CSS and JS files. The total will give you the page size.
One caveat, if the site is using rollovers or the CSS is referencing images, they will not be brought over with the Save As. You need to manually grab them.
If you have direct access to the site's files, just grab all the sizes and add them up (HTML, CSS, JS & images). Don't forget that if the site is using server side code, you do not count this in the file size. Only used the compiled page that the browser renders.
HTH
I just gave it one of my homepages which has images delivered by script (to protect them ) ..the "tool" reads the page size as just under 11k ..which is true for the pure html ..
However the ccs sheet is another 8 k
the java "control file" is another 11k
the images total 72k ....
and because the "tool" doesn't read java it says there are no images on page ....without them there is no real content as it is an artwork site with 11 images on the index page as jpegs plus 17 gifs ...
if your page takes three or four full scrolls to get to the bottom ..and the top area is interesting enough ..most people dont read fast enough to notice that its not all there yet before it all gets there ..if you see what I mean ..
I do have other sites where the entire entry page is only around 15k and still others with 35k including one image and an entry link ( I can hear them now "*ù*$^*ù*^splash pages!" works tho : ) ...horses for courses ...and SEO ...
fastest page I know of around here belongs to bcolflesh ....loads so fast its scary! ; )