Response time is also known as time to last byte while Latency is time to first byte:
- Time to last byte - time from the moment the request was sent till the last resource is finished downloading.
- Time to first byte - time from the moment the request was sent till the first byte of the first resource is received back.
Is that what you wanted to know or have I misunderstood your question?
EDIT:
Here is a more detailed explanation off all possible performance measurements.
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