Ok, I think you are confusing a few things here. That 72 MBPS speed is the connection from your lappy to the router, NOT from the lappy to the internet. Logging on to the modem itself will give you your upload and download speeds, OR you can head to dslspeedreport.net, and run a test there.
What is your connection speed to the internet now, and what was it before? What are the specs on the lappy? If the lappy is old and slow, getting a faster internet connection won't make it load things any faster.
The IPV6 throws up a flag for me as well, I don't think you should be using that. I'm pretty sure it should be IPV4, but let's get the other info first.
That dlsspeedreport doesnt work. My laptop is brand new, 4gb ram 250gb HD, pretty shitty video card though. I just dont know why my internet is so slow, everything else on my computer is fast