Performance and UX

Image optimization

Choosing image dimensions, compression, format, and loading behavior for their use.

A practical example

A thumbnail avoids using a full-resolution, multi-megabyte image.

What should I know?

Excessive compression can make it harder to assess a product.

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.Lazy loadingDelaying resources not yet needed, such as images far below the viewport.Alternative textA text description of an image's function or meaning for people and systems unable to see it.

Documentation and further reading

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

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