Home / Technical SEO / AI Core Web Vitals Audit & Optimization
Make your website fast — and prove it with Google’s own numbers
Start with the audit to see what slows you down. On WordPress, go further: we find the real bottleneck, apply the fixes in rounds you approve, and only call a change effective when the numbers move beyond the noise.
A change is “effective” only when the metric moves beyond the published noise band.
What are Core Web Vitals — and how does AI help?
Core Web Vitals are Google’s measurements of how a page feels to a visitor. There are three: LCP (Largest Contentful Paint — how fast the main content appears), INP (Interaction to Next Paint — how quickly the page responds to taps and clicks; it replaced FID in 2024) and CLS (Cumulative Layout Shift — how much the layout jumps while loading). Google uses them as part of its page-experience signals.
The hard part is not measuring them. It is finding the one real cause among the 40 items PageSpeed lists. Our audit reads the full Lighthouse evidence and explains which items actually matter. On WordPress, the optimization goes further: it pins down the LCP element and what delays it, applies fixes through our plugin in rounds you approve, and judges every change against a published noise band so a lucky test run is never sold as progress.
Two services, one goal: a measurably faster site
Audit for any website. Optimization for WordPress — it includes the diagnosis, the applied changes and the results report.
- Audit — Google’s measurementsPerformance score, LCP, INP, CLS, FCP, TTFB and Speed Index against Google’s thresholds, for mobile or desktop.
- Audit — what PageSpeed flaggedUp to 12 failing Lighthouse audits explained, issues by severity and at least 6 recommendations tied to a metric.
- Optimization — real diagnosisThe LCP element and its timing breakdown, render-blocking files one by one, fonts, images, unused CSS/JS, third parties, long tasks and real-user field data when Google has it.
- Optimization — changes applied for youThrough our WordPress plugin, after you approve each round: deferred scripts, LCP preload and priority, lazy loading, font display, preconnects and more.
- Optimization — safety netAfter every round: a compatibility check (console errors, failed requests, screenshot comparison) and automatic rollback if anything gets worse.
- Optimization — guided manual stepsWhat the plugin cannot change (theme code, host settings, images) is guided step by step in the chat, and verified by code afterwards.
- Optimization — before & after reportEvery metric with its change and the noise band, and the status of every change with its evidence.
- No double saleSettings already active on your site are shown as “already applied” — never sold again.
Slow pages cost you visitors before they read a word
Your PageSpeed score is red
But the report lists 40 items and you don’t know which one actually matters. We find the element that really loads late and why.
You installed a cache plugin and nothing changed
Generic toggles rarely fix the real cause — a heavy hero image set by a slider, dozens of blocking stylesheets, oversized fonts.
Your developer needs a precise brief
File-by-file findings and a task list, instead of “make it faster”.
Why speed work pays off
Visitors who stay
People leave slow pages before they read them. A faster first view gives your content a chance to be seen.
A better page-experience signal
Passing Core Web Vitals removes a known weakness in how Google assesses your pages. It supports rankings; it does not replace good content.
Smoother buying
A page that responds instantly and does not jump under the finger makes forms and checkouts easier to finish.
Proof, not promises
Before-and-after numbers with a noise band show exactly what moved — useful for you, your developer and your boss.
Choose the depth you need
$99 one-off
- Any website · mobile or desktop
- Delivered in about 10 minutes
- Web report + PDF by e-mail
$299 one-off
- WordPress · plan in about 60 minutes
- Up to 3 rounds + guided manual steps included
- Before & after results report
Diagnosis first. Changes only with your approval.
Free health check
A real PageSpeed test on your live site in about a minute.
Audit or optimization
The audit arrives in about 10 minutes. The optimization plan arrives in about an hour, built from a median of 3 Lighthouse runs.
Connect and approve (WordPress)
Install the Deep SEO Optimizer plugin, connect it from your own wp-admin and approve the round. Nothing changes before that.
Measure, judge, repeat
We re-measure after each round and judge every metric against the noise band. Up to 3 rounds are included.
Measured the way Google measures. Judged honestly.
Measured from real data
- Google PageSpeed Insights / Lighthouse on your live homepage.
- Optimization: median of 3 runs, plus Chrome real-user field data (28 days) when your site has enough traffic.
- Published noise band — e.g. LCP ±300 ms or 10%, CLS ±0.02 — so a lucky run is never called an improvement.
- The task list comes from fixed rules applied to your evidence; the AI explains it but cannot add tasks.
What it does not do
- The audit measures one page (your homepage) in one run and never touches your site.
- Optimization is WordPress only and covers the homepage template; other templates are not measured yet.
- Some fixes (critical CSS, image compression, self-hosted fonts, page cache) are guided manual steps, not automatic yet.
- We do not ask for passwords, admin logins or FTP access — ever.
- No one can promise a specific score. We show exactly what moved.
Why choose Deep SEO for your Core Web Vitals services?
Diagnosis first
Fixes come from fixed rules applied to your evidence. The AI explains the plan but cannot add tasks to it.
Changes only with your approval
Nothing on your site changes until you approve a round in the chat. Every change can be undone.
An automatic safety net
After every round we check console errors, failed requests and screenshots. A round that makes things worse is rolled back automatically.
Honest judging
Median of 3 Lighthouse runs and a published noise band. “Within noise” is reported as within noise.
Prefer our team to do the work by hand? See Core Web Vitals Optimization (agency).
Tools we use for the Core Web Vitals services
- Google PageSpeed Insights / LighthouseGoogle’s own lab measurements for speed and Core Web Vitals.
- Chrome UX ReportReal-user field data from Chrome, when your site has enough traffic.
- Deep SEO Optimizer (WordPress plugin)Applies approved changes on your site and can undo every one of them.
- Headless Chrome checksScreenshots and console logs before and after each change.
- Leading AI models (OpenAI, with Claude as failover)Explain the evidence in plain language. They never produce the numbers.
- Independent quality reviewEvery report is checked against its evidence before it reaches you.
Quick wins you can try yourself
Find your LCP element
In PageSpeed Insights, open “Largest Contentful Paint element”. If it is a hero image, make sure it is not lazy-loaded and is served in WebP or AVIF at the size it is shown.
Give images and embeds dimensions
Width and height attributes (or a CSS aspect ratio) reserve space and stop layout shifts.
Stop autoplay sliders on the homepage
Sliders often delay the main image and add JavaScript. A single static hero is usually faster.
Audit your plugins
Every plugin that adds scripts to every page costs time. Remove what you no longer use.
Use font-display: swap
Text then appears in a fallback font immediately instead of staying invisible while web fonts load.
Frequently asked questions about the Core Web Vitals services
Which one should I choose?
If you are not on WordPress, or you want a diagnosis for your own developer, take the audit. If you are on WordPress and want the changes applied and measured, take the optimization — it contains its own diagnosis, so you do not need both.
Can the optimization break my site?
Every round is checked for console errors, failed requests and visual differences against the untouched page. A round that makes things worse or fails the check is rolled back automatically.
What if I am not on WordPress?
The optimization is refused before any payment, and the consultant offers the audit instead.
What if nothing improves?
The results report says so plainly — we never call a change effective without evidence. Talk to us in the chat and a person will follow up.
Why is INP sometimes shown as N/A?
INP measures real interactions. Lab tests often cannot produce it; when Google has field data for your site, the optimization report shows the real-user value.
Do you need my WordPress password?
No, never. You install the Deep SEO Optimizer plugin and connect it from your own wp-admin. You can disconnect it at any time.
Find out what really slows your site down
Free speed check first. Then the audit, or the full WordPress optimization.
Rather talk to a person first? Request a free consultation.
Often ordered together
All AI services in one place: the Deep SEO AI platform.