On numerous download occasions, the "transfer rate" displayed by the 'Saving File' pop-up starts at an unrealistically high value, then gradually declines to the actual average value.
Mozilla performs downloads into a temporary directory, allowing the actual transfer to start before the final destination has been determined (via a 'File' dialog). I suspect that with the 'Saving File' pop-up "transfer rate" value, the numerator is the actual number of bytes transferred, while the denominator is the amount of time since the 'Saving File' pop-up came up on screen. Because it is possible for the showing of the 'Saving File' pop-up to be delayed, IMHO what instead should be used for the "transfer rate" denominator is the time since the byte transfer started. mikus
