Advanced – Non-Functional Testing
Bottleneck – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A point in the software or system where performance is limited by a specific resource.
In simple words
The single slowest step that caps overall throughput.
Exam tip
Fix the top bottleneck first — everything else is noise until then.
Related terms
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