Care to clarify? Throughput is determined by the bandwidth-delay product which is a function of bandwidth and, just as critically, latency (literally bandwidth * rtt). And jitter is just variable latency.
The bandwidth delay product is the amount of data in flight. That's not throughput. You can have a huge amount of data in flight on a fast connection just fine. Someone else said the calculator assumes a max window size of 64KB which is extremely unrealistic.
