Ideal API Response Time

Benchmarks and alert thresholds for your APIs.

An API's response time directly impacts user experience and application performance. Slow APIs create frustration and can cascade into outages.

This guide presents benchmarks by API type and recommended alert thresholds.

Benchmarks by API Type

Recommended response times by context:

API Type	Excellent	Acceptable	Slow
Simple REST API	< 100ms	100-300ms	> 500ms
API with DB	< 200ms	200-500ms	> 1s
Aggregation API	< 500ms	500ms-1s	> 2s
Export/Report API	< 2s	2-5s	> 10s

Request complexity: simple requests should be fast, aggregations can be slower.
Geographic distance: network latency adds to processing time.
Server load: times increase under heavy load.
Dependencies: each external call adds latency.

No, use a threshold of N slow requests in X minutes to avoid false positives.

P95 or P99 is more representative than average, which hides outliers.

Optimize DB queries, add caching, reduce synchronous dependencies.

Yes, response time includes TTFB (Time To First Byte).

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