Advanced Level – Cross-Cutting
Response Time – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The time between a user request and the system's response.
In simple words
Time from click to visible result — the classic user-perceived performance metric.
Exam tip
P95 and P99 response times matter more than the average; averages hide tail latency.
Related terms
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