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They could certainly have changed things, but whether this is the cause is not completely clear.

Whilst I don’t use broadband, I have tried a similar tool to try and eke out as much as I can from my dial-up. Now before making any changes I first dis some tests to gage my existing throughput and then used the tweaking tool and tested again so you have something to compare against.

Unfortunately for me it had a detrimental effect, I was also negligent not to commit my existing settings to paper or save existing settings, so I was forced to used the option, ‘restore windows defaults.’ This had the desired effect in restoring my previous connection/download speed.

Unless you have done something like this there really is no way to say for sure what has happened, some ISPs are guilty of throttling bandwidth and or what is called ‘traffic shaping,’ this can restrict the bandwidth according to the type of activity your are doing. This is most likely applied to P2P applications as this really hammers bandwidth.

So you need to ensure there is no problem at your ISP and try restoring the defaults in speedupmy PC if it has that capability.

Other than the above I’m afraid I can’t be of much help.