Performance and response times
You MUST define a maximum response time and specify any exceptions.
To improve performance and minimise network traffic, you SHOULD consider the following options. Your choice depends on your use-case and user needs:
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Implement a server-side cache (for example, ASP.NET output caching) or a distributed cache (for example, Redis) for more complex scenarios.
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Allow clients to cache responses (response caching) while taking care to mitigate any potential security risks; see HTTP Messaging caching.
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Avoid blocking calls. For example, ASP.NET web APIs SHOULD use the async keyword.
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Take advantage of paging and filtering to limit the amount of data returned in responses.
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Compress responses and minify JSON payloads.
You MUST monitor and analyse API performance and take corrective actions if your APIs do not meet the performance thresholds defined in your solutions architecture.
Further reading and information