A site that feels quick on a development computer may behave differently on a mobile device. Use representative pages and a repeatable testing setup that reflects the audience’s likely conditions. Include long pages and image-heavy sections, not only the simplest route.

A practical approach

Separate the symptom from the cause. Slow visual completion might involve large assets, delayed fonts, scripts or server response. Investigate the largest contributors before making small cosmetic optimisations. Record changes so later comparisons refer to the same page and test conditions.

Your checklist

  • Test a home, service and content-heavy page.
  • Use realistic device and network assumptions.
  • Recheck important interactions after performance changes.

For example

An online catalogue may load its initial heading quickly while product images arrive much later. Reviewing the whole shopping task gives a more useful picture than recording only the first visible text.

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