Page speed insights from tools like GTmetrix are crucial for SEO because they directly impact user experience and rankings.

1. Improved User Experience: Google recommends that pages load within 3 seconds or less. Sites that take longer risk higher bounce rates, and as load time increases from 1 to 5 seconds, bounce rates can increase by 90%.

2. Higher Search Rankings: Google considers page speed and Core Web Vitals (LCP under 2.5 seconds, FID under 100 ms, and CLS under 0.1) as key ranking factors. Sites that load faster perform better in search results.

3. Mobile Optimisation: Since Google uses mobile-first indexing, optimising for mobile speed is essential for ranking well on search engines.

In short, using GTmetrix to improve page speed ensures better user experience and helps achieve higher rankings by meeting Google’s speed and Core Web Vitals requirements.