that DPC Latency Checker
seems to be a fad that someone started... they tell you to run it but dont bother to explain what it's designed to do.
one thing i would suggest is installing firefox and getting the addon called "firebug
". when installed, you can enable the console that allows you to see exactly how long it takes to load webpages, listing each piece of information (images, js files, etc) separately and showing you how long each file took to download in the grand scheme of things.
then, i'd grab your laptop and do the same thing. install firefox and get firebug. visit the exact same webpages to see if there's any marked difference in the download speeds.
see attachment for a screenshot of this in action. it's very simple to run. you go to the web page, enable firebug, and hit refresh. its "net panel" does the rest. you won't have to "guess" how long it takes pages and elements on a page to load anymore.