Response time calculation
Response time is calculated using the time difference between data packet request to data packet response. Response time is not calculated with SYN, SYN/ACK, or ACK packets.
 
There is one circumstance where SYN-ACK is used for calculating client response time. The very first client response time is calculated by measuring the time difference between the server SYN-ACK and the client’s first data packet. In all other circumstances, the time between data request and data response is used for calculation, as shown in Figure 34.
 
Figure 34: Response time calculations
Diagram of response time calculationDiagram of response time calculation