Compare familiar scenarios
Select a category, product and important checkout step. Measure under comparable conditions, considering server response and the visible customer experience.
Investigate the cause
Large images, scripts, module workload and database queries can all contribute. A theme change will not fix a slow external API. Separate the causes before choosing an intervention.
Check more than a score
Retest prices, stock, cart and checkout after changes. Caching must respect visitor-specific differences. Keep the baseline and record the effect of each change.
Official PrestaShop documentation ↗
Related reading: Improve PrestaShop performance and PrestaShop performance improvement.