Easiest way to figure out how much bw you have is to divide the number the company says they give you. 4mb = 400k cap, 10mb = 1000k cap, 512k = 50k cap, etc..
Unless you can find a data center very close to you for a test you will likely get numbers all over the board. Caching really isn't a concern cause you are sending and receiving packets just to get a generalization of speed. I honestly don't think any of them are ever very accurate. Best way is to do the math yourself.
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