Performance and UX

Lazy loading

Also known as: deferred loading

Delaying resources not yet needed, such as images far below the viewport.

A practical example

Thumbnails for later articles load as the user scrolls.

What should I know?

Loading the main image too late can hurt perceived speed.

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

LCPThe time when the largest significant content element appears in the initial viewport.Image optimizationChoosing image dimensions, compression, format, and loading behavior for their use.Performance budgetDefined limits for resource size or speed metrics that help control website development.

Documentation and further reading

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

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