Performance and UX

LCP

Also known as: Largest Contentful Paint

The time when the largest significant content element appears in the initial viewport.

A practical example

A large product photo takes a long time to download.

What should I know?

LCP does not measure completion of every page operation.

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

Core Web VitalsUser experience metrics covering main content loading, interaction response, and layout stability.Lazy loadingDelaying resources not yet needed, such as images far below the viewport.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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