Performance and UX

TTFB

Also known as: Time to First Byte

Time from starting a request to receiving the first response byte.

A practical example

Slow server page preparation delays further loading.

What should I know?

TTFB is not the time needed to display the entire page.

Performance and UX in practice

Assess real users' experiences on their devices. Lab tests help identify causes, while user data shows the scale of a problem. A good website also makes information easy to find and tasks easy to complete.

Related Semly features

See where this concept applies when working with Semly.

Google Search ConsoleConnect search data to Semly. Analyze queries and page performance when planning next steps.AI analyticsCompare visibility, position, sentiment, and brand share in AI answers.

Related terms

SSRGenerating a page's HTML on the server before sending it to the client.CacheStoring a prepared response or resource to serve later requests faster.CDNDistributed infrastructure serving resources from locations closer to users, often with caching.

Documentation and further reading

Definition prepared by Semly. Standards and behavior are described by their creators:

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