Tool

GTmetrix: Website Performance Testing and Monitoring

GTmetrix · gtmetrix.com Freemium Beginner

The most detailed free speed-test tool - waterfall view, device simulation, and specific fix recommendations - so you know exactly which app or image is slowing your product page down, not just that it's slow.

  • Free tests use Lighthouse under the hood, same as PageSpeed Insights.
  • Test on 55+ simulated devices, useful for checking mobile performance on budget Android phones.
  • Paid tier adds monitoring and historical tracking if you want to catch regressions after every app install.
Open on gtmetrix.com ↗

The question it answers

  1. How do I make my store load fast enough to pass Core Web Vitals?

Read with it

  1. This is literally what Google uses to score your Core Web Vitals for ranking - if you only run one speed test before launch,... pagespeed.web.dev Tool PageSpeed Insights Google
  2. Written for Indian 4G conditions and Indian Shopify stores specifically, with a real before/after case study - a Delhi store's... sociolabs.in Article Shopify Speed Optimization Guide 2026 (India) Socio Labs
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