Measure before changing
Check mobile and desktop separately. Distinguish server response, hero image loading, text rendering and interaction delays. A laboratory test may differ from actual visitor experience.
Seven areas to inspect
- Image dimensions and formats.
- Initial server response and redirects.
- Cache rules.
- JavaScript size and execution.
- Blocking CSS and fonts.
- Third-party widgets and tracking.
- Data queries and page rendering.
Retest under comparable conditions after each change.
Prioritise the customer journey
Start with the page that matters most for enquiries and its main action. A fast training image does little if the registration button fails. Assess technical metrics alongside form reliability and the enquiry path.