What to know
PageSpeed Insights evaluates a supplied URL and helps identify performance improvements. It is useful when an otherwise helpful page feels slow or difficult to use.
A practical starting point
Test an important landing page, record the conditions, and prioritize issues that affect the reading or interaction experience. Ask your developer to verify the effect of changes.
Keep in mind
A single score is not an SEO strategy. Test representative pages and consider the actual visitor experience rather than chasing a number in isolation.