I ran Google's utility to see if my ISP (Timewarner cable) throttles it but the tests came out negative.
Oh please. There may be other things going on that have nothing whatsoever to do with the small chunk of the path that is from your machine where it hooks up with the 'real' internet...
BUT listen to what the FCC says: ALL repeat ALL the cablecos in the US 'shape','manage', 'mangle', and otherwise 'stomp' on user connections, PERIOD. Right now, they're busy, as most of the commissioners are new (new administration) grappling with the hordes of hyper-paid lobbyists and the republican leftovers in crafting rules and fines that may, MAY, do some good 10 years from now.
But what you need to do is do a proper study of the path between you and the news-server you're connecting to. Remember, as using a cableco, you are on a 'party-line' (if you don't remember what those were with voice, find and read the wiki on it), and you are jostling with every other user on that cable system for bandwidth, depending on a LOT of factors, including the fact that you're competing for bandwidth on that cable system with 'real' revenue generating 'services' like VOD.
Which includes how the system was designed (or not), how it interconnects through the path, how it... just simply a lot of factors. The finger may point at the 'local' connection, but indeed may be that the throttling is taking place somewhere else along the path.
I get slowdowns on my path between myself and Astraweb, comes and goes. But it's not my local link (DSL) or ISP (Verizon), but usually one of the interlinks out there in fiber-land, like Global-Crossing or Alter-Net. It comes and goes, but is 'visible' even on my somewhat slow speed 'local' link. I'm sure if I was on FIOS I'd see the same thing.
As more and more big corporation use the 'public' internet to ship massive amounts of data across the planet for 'free' (in comparison to having leased circuits to do so), these slow-downs are common. Ten years ago, few used it, relying on those leased circuits. But I helped design a LOT of systems that used VOIP to India and the far east, and it's taken off from there.
I could go on and on, but what you're seeing is what every user of cableco data systems sees. You simply have to live with it.
(Now, I'm sure that other cableco users will chime in and say 'I have no problems' but they are the slim minority; everyone around where I live in Comcast land has major problems, and from what I continually read, TimeWarner is in about the same boat)