As a test, I will be downloading a file from Microsoft's website every day at different times to see if my download speed flutuates.

The Sysinternals Suite is a 13MB zip file. A good size for a test file and it has excellent tools for Windows PC diagnostics (that's a bonus).

Theoretically, at 16Mbps, this should take no more than 10 seconds to download. I've just completed three downloads in a row taking 290 seconds, 295 second and 300 seconds . Not good at all. I would have been happy with 20-30 seconds, but an order of magnitude out?