The decision
Choose image sizes and formats appropriate to their actual display purpose. Preserve informative detail and accessible alternatives while avoiding unnecessarily large transfers.
Rehearse this before accepting the change
Compare a page before and after image changes at the same screen size.
Use fictional examples and an authorised test environment. Record what happened, the evidence you inspected and any issue that still needs a responsible owner.
Choose a useful measure
Measure image transfer size and visible loading behaviour.
Agree the definition and baseline with the team doing the work. Review the result over a comparable period and note other changes that could affect it.
Your planning worksheet
Use these checks to prepare a discussion with your team or supplier. Tick a check when you have recorded the decision or evidence, rather than when a feature has simply been promised.
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Further reading
These primary sources provide additional context for the project decisions above.
Related decisions
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