Latency budget
Measure the same-turn critical path and separate overlap from true blockers.
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The ideas to retain
A latency metric needs two explicit boundaries
Saying "we have 400 ms of latency" is incomplete. You need to know which event starts those 400 ms and which event ends them.
The clock is part of the definition
Subtracting timestamps from different machines is valid only if you know how their clocks relate. In a distributed system, clock offset or drift can corrupt a small duration.
The critical path matters more than the sum of full stage times
In a classic STT → LLM → TTS pipeline, this expression is tempting:
Key moments
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