Were you D/Ling the same file at the same time on the same line? That would certainly cause slowdowns. If your computer is very old, as in less than a 1Ghz, then your proc could be limiting transfer (test thsi by timing how long it takes to send a large file with Windows filesharing via a lan). Also, go to TestMy
to get an actual, measured speed test. On your DSL line though, those speeds are exactly what you should be getting. Note that your line is measured in kilobits per second, while most browsers use kilobytes (8 bits to a byte), hence your seemingly slow speed.