Free Tool
Website Performance Checker
Understand the Core Web Vitals that decide whether visitors stay or bounce.
A guided checklist and scoring rubric for LCP, INP and CLS. Learn what to measure, how to measure it, and which fixes move the needle for your stack.
This is a free educational tool provided by NorthFlow Studio. Estimates are illustrative — book a call for a tailored assessment.
How it works
- 1Review the Core Web Vitals definitions and targets.
- 2Run a field or lab test using the linked approach.
- 3Score each area and prioritise the lowest scores.
Who it helps
- Developers improving site speed.
- Marketers worried about bounce rate.
- Agencies auditing client sites.
Frequently asked questions
What is a good LCP?
Under 2.5 seconds is the target. Between 2.5s and 4s needs work; over 4s is poor.
Lab vs field data?
Lab data is synthetic (Lighthouse); field data is from real users (CrUX). Optimise using field data when available.
How do I measure INP?
Use field data from CrUX or the web-vitals library; INP under 200ms is good.
Want this built into your business?
Book a free strategy call. We'll map your bottlenecks to the right systems and send a clear roadmap — even if we don't work together.
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