Queue Latency
Definition
Queue latency measures the time until processing begins.
The observed time from enqueuing a work item until the start of its processing; measurement points, percentile, and the queue considered must be defined.
Simply explained
A task has already arrived but is still waiting for someone or something to start working on it.
Why it matters in practice
The term contributes to secure, maintainable, and high-performance web applications as well as resilient technical decisions.
Example from business
A document waits 18 seconds before an OCR worker picks it up.
Limits and pitfalls
- Mixing queue latency with processing or total turnaround time, considering only averages, or losing aborted elements from measurement.
Origin & history
Waiting delay is a central metric in queueing theory and modern SRE measurement.
Use in mid-sized companies
- Possible application: A document waits 18 seconds before an OCR worker picks it up.
Frequently asked questions
What does queue latency mean?
The observed time from enqueuing a work item until the start of its processing; measurement points, percentile, and the queue considered must be defined. What errors should be avoided? Mixing queue latency with processing or total turnaround time, considering only averages, or losing aborted elements from measurement.
Sources
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
Editorially reviewed on: