I don't know what it does because my browser 'web site security' add-on WOT, (Web of Trust), warned me away from the web site. I won't post the web site here in it's clickable form in case others click it in error.
This is what WOT says, http://www.mywot.com/en/scorecard/doublemyspeed.com
"Used for the distribution of "rogue" security or other such applications"
"Phishing Scam Website! -This site provides applications or services "Rogue" "
Whatever it offers my advice is to stay away. And that CNET logo? Is it clickable? If not they just copy/pasted the logo image onto their web site.
Has anyone use doublemyspeed.com? on their page is has CNET....so do they recomment this utility?? Can't afford a new computer yet..so trying to get more speed.