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I am on a 10 mbit connection. If I start a download from a server thats a little busy and is only sending me data at 6mbit/sec then the other computers in the house have 4mb/s available. The faster your connection the harder it is for you to find a server that can fully utilize your capacity. If I get a server sending me data at 99% of my capacity the other users have 1% left. The TCP optimiser (which changes RWIN) has been explained in the following way: Consider you have to move a pile of dirt from one side of the yard to the other. If you fill your wheelbarrow to the brim you will make less trips but if you loose control and spill its going to be a big mess. On the other hand you can make many small loads where any accident is going to be relatively small. RWIN is the amount of data in bytes that can be downloaded withOUT confirmation of arrival at your end. By increasing RWIN you receive more data before saying "I got that delivery, send another one". If your on a 30mb/s line then open TCP optimizer move the slider to 30mb, select the network adapter your currently using (wireless/NIC), then at the bottom select optimal and apply. Mind you that if your provider is have problems then all the tuning in the world won't fix their messed up network. What company are getting your internet from? speedtest.net will tell you your best case while testmy.net will tell you when there is a problem.

Internet providers show speed in Kbps, Mbps and Gbps because that's the correct scale for line speed. You use kB/s, MB/s and GB/s to describe the speed of a file transfer. Well, your max speed isn't far off from where you should be. But you have a few lame results in there. Check out the Automatic Speed Test. Run it for a while and gather some more data. I wouldn't worry about the cap. When I worked for the cable company the same policy was in place... but I've been told that it's not strictly enforced. If you're using your connection normally you'll be fine. What the cable companies are really looking for is massive outgoing traffic on a connection ... people abusing the terms of use. Trust me, Cox has a similar policy... I draw Terabytes and nobody's shutting me off. Also, if you read online, in forums about people saying that they got shut off because of that. I'd bet you a thousand bucks that every single one of those people was sharing files on a ridiculous scale. Just don't get stupid, limit your sharing and you'll be fine.