Quote
Free tool
Lightning snapshot
Core Web Vitals
AI fix order
Mobile & desktop
Site speed, measured properly
A Lighthouse read on your URL: Core Web Vitals, category scores and what to fix first. One complimentary check per email, capped fairly so the tool stays fast for everyone.
92
Example perf score
1.8s
Example LCP
<30s
Typical run time
Run check
Your URL, measured in seconds
Powered by Google PageSpeed Insights under the hood. Toggle mobile or desktop, enter a work email, and we queue a capped Lighthouse snapshot.
Lighthouse snapshot
No account required
Device
One complimentary check per email and per network. We use this fairly so the tool stays free to run.
Example snapshot
preview
Performance score
- LCP
- INP
- CLS
- TTFB
Illustrative values only. Your run returns live scores plus a link to the full PageSpeed trace.
Core Web Vitals
What we measure
Lighthouse bundles lab data with field-style signals. These are the numbers that usually explain why a page feels slow or jumpy.
LCP
Largest Contentful Paint
When the main hero image or headline block becomes visible. Slow LCP usually means heavy images, slow server response or render-blocking assets.
Good target: ≤ 2.5s
INP
Interaction to Next Paint
How quickly the page responds after a tap or click. Lag here feels like a broken button even when the page looks fine.
Good target: ≤ 200ms
CLS
Cumulative Layout Shift
Unexpected movement while the page loads. Banners, fonts and late-loading ads are the usual suspects.
Good target: ≤ 0.1
TTFB
Time to First Byte
Server and network latency before HTML arrives. High TTFB points at hosting, caching or backend work, not just frontend polish.
Good target: ≤ 800ms
FCP
First Contentful Paint
When anything meaningful first appears on screen. A fast FCP reassures visitors the page is alive.
Good target: ≤ 1.8s
TBT
Total Blocking Time
How long the main thread is busy during load. Heavy JavaScript is the common culprit on marketing sites and shop fronts.
Good target: ≤ 200ms
Pipeline
How it works
Fast queue, honest limits, human-readable output. No mystery dashboards or enterprise upsell mid-flow.
Paste your URL
We normalise the address, pick mobile or desktop emulation, and queue a Lighthouse run via PageSpeed Insights.
Fair-use gate
One complimentary check per email and per network keeps the tool free to run without becoming a scraping endpoint.
Scores land in seconds
Performance, accessibility, SEO and best-practice categories return with Core Web Vitals and a link to the full trace.
Prioritised next steps
Our models summarise what to fix first: images, caching, scripts or hosting. Humans review anything we quote on.
AI-assisted
What to fix first
Raw scores are useful; ordered advice is better. We route Lighthouse output through modern models to cluster issues by impact, then surface the fixes that move Core Web Vitals the most.
That is the same mindset we use on client sites: images before micro-optimisations, caching before cosmetic rewrites, hosting before blaming the theme.
Images and hero weight
Modern formats, sensible dimensions and lazy loading often move LCP more than micro-optimising CSS.
Caching and compression
Browser cache headers, Brotli and a CDN edge can slash TTFB without redesigning the site.
Third-party scripts
Chat widgets, trackers and tag managers stack up. Defer or self-host what you actually need.
Hosting and TLS path
UK-first infrastructure with sane DNS and HTTP/2 or HTTP/3 is the bedrock everything else sits on.
Business case
Why it matters
Speed is not a badge for developers. It is how customers decide whether to stay, buy or call you back.
53%
mobile abandon rate
Google research: over half of mobile visits leave when load passes three seconds. Speed is revenue, not vanity.
Core
Web Vitals signal
LCP, INP and CLS feed real-world ranking signals. Fixing them helps humans and search engines alike.
UK
team, same stack
We host, build and tune sites on the same platforms we measure. Results map to work we can actually ship.
Why we cap it
API quotas and abuse protection keep this sustainable. Full audits and remediation are what we do for clients. This is a tasteful taster, not a scraping endpoint.
What you get
Performance, SEO, accessibility and best-practice scores for the analysed URL. For waterfalls and traces, use the official PageSpeed link we show with your results.
Need real-world speed work?
Hosting, Core Web Vitals and frontend polish under one UK team. WaveSites from Launch to Surge, or run WaveCheck free before you commit.