I'm paying an extra $10 month for guaranteed highest available speed on Comcast, but I really can't tell any difference at most sites.
That is because the rate the packets travel now are the same.
You data connection has nothing to do with how someone else's website performs.
It depends on:
1 - how fast your computer is
2 - the bandwidth allotment of the server/host package where your website is hosted
3 - the design of the website (high graphics/media)
4 - browser enabled to receive content (java block?)
This is a lot of talk to add a surcharge onto net access.
"guaranteed highest available speed"??? Isn't that a meaningless phrase? Kind of like the "all you can eat for $10 buffet". After two hours the owner throws out a gluttonous customer who objects, saying "But I thought it was all you could eat for $10". The proprietor replies "Well, that's all you can eat for $10"!