Separate different performance problems
A slow product image, heavy app script and delayed interaction need different fixes. Test templates and key actions under consistent conditions. Lab measurements help reproduce a problem; real-user data helps show who experiences it.
- Check collection, product and cart templates
- Record device and network conditions
- Look at loading and interaction
- Separate measurement from diagnosis
Prioritise changes with an ownership cost
Large images, repeated tracking scripts and unused app features are useful starting points. Removing code carelessly can break product options or marketing attribution. Agree the business function behind a script before changing it.
- Audit installed apps and theme scripts
- Resize images for their displayed use
- Protect essential checkout behaviour
- Compare app and code maintenance costs
Verify the shopping journey after optimisation
A faster page is not a useful improvement if variants or cart updates stop working. Retest representative products and mobile interactions after changes. Keep the baseline and final measurements together with the release notes.
- Repeat tests under the same conditions
- Check product choices and cart updates
- Verify analytics still behaves as intended
- Record measured improvements and limitations
A common question
Is a speed score the same as a sales result?
No. Speed measurements describe performance. Sales outcomes require store data and enough comparable traffic to assess the change.