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there have been many experiments on this and it does reduce by about 10-15%
and reduced even more over time.
Have also just seen there are loads of internal links using non-www version of the url.
I know...I would be using relative urls but the site is run off a CMS. It uses the full url.
Is the 10%-15% your personal estimation based on your gut or are there actually experiments out there that have each proven a percentage between 10%-15% to be the reduction?
I'd like to see these experiment reports, because I couldn't disagree with the numbers more....