"Throughput is like pumping water through a hose. Either something isn't pumping fast enough, or somewhere the hose is squeezed really small, restricting the flow. In both cases, somewhere we have a problem with CPU or Memory or I/O or contention or parallelism."
"Persistent connections (HTTP 1.1) reduce communication lag perceptibly, because the client doesn't need to renegotiate the TCP connection after each request."
