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Edited on Thu May-11-06 08:03 PM by RoyGBiv
Like all providers of Internet service, the advertised speed is a "maximum average," which sounds great but is really just a way of saying the best speed you'll get "on average over time" is 768 kb/s. The fact you don't get 768 kb/s all the time is not truly the fault of the ISP. Numerous things affect effective down/up speed on a moment to moment basis. The speed at which your hard drive writes data is an often overlooked yet significant factor in effective speed. Downloading 100 1 meg files will result in a lower average speed than 1 100meg file due to factors such as this.
If you have a 768 kb/s connection on DSL, 698 is actually pretty good for a basic, single test of that speed. Try downloading a large file from a nearby server (nearby meaning few hops between you and the remote server) at around 3-4am. I'd be willing to bet you get better than 768 for brief periods and that the average over several minutes is closer to 768. However, since you're using DSL, your effective speed, no matter the maximum, is going to be affected by the distance you are from the node that serves your area. People right on top of it will generally get closer to top speeds than people farther down the line.
As for the original question, for what tasks are you wanting to increase your speed? If it's basic web browsing you're talking about, you can do a number of things that increase perceived speed through caching, memory management, etc. If you're wanting to increase it for down/up, there are fewer things you can directly do. Streamlining your system is one thing you can do, but it's not going to get you much better than you are getting now really.
BTW, be aware of your definitions. What you have is a 768 kilobits per second connection as opposed to the 3000 kb/s connection you had previously. The difference even in maximum average is quite dramatic and so very noticeable.
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