BrisTechTonic is a Bristol SEO agency offering core web vitals and site speed that gets UK businesses found on Google, the local map pack and the AI assistants they now ask, like ChatGPT and Perplexity. Core Web Vitals are the performance signals Google measures, loading, interactivity and visual stability, and buyers feel them as a fast or a frustrating site. We fix them at the source, in the code and the delivery, rather than bolting on a plugin that games the score without improving the experience.
Google uses Core Web Vitals as a ranking signal, and slow, unstable pages lose conversions regardless of ranking. Most speed fixes are cosmetic, a caching plugin that improves a lab score but not the real experience. Real gains come from the source: the images, the scripts, the render path and the hosting. That is harder, and it is what actually moves both the numbers and the revenue.
What does core web vitals and site speed put on your desk?
What does core web vitals and site speed include?
Largest Contentful Paint (loading)
How long it takes for the biggest, most important thing on the screen to appear, usually the main image or heading. We trace a slow one back to its real cause, whether that is an oversized image, a slow server, or something the browser is forced to wait on.
Explore →Interaction to Next Paint (responsiveness)
How quickly the page reacts when someone taps, clicks or types. Poor results here are almost always caused by heavy background code holding the page up, so we tackle that code rather than just the symptom.
Explore →Cumulative Layout Shift (visual stability)
A measure of how much the page shifts around as it loads. We fix the causes, such as images with no space set aside for them, text that loads late, and banners that pop in, so buttons stay where a customer expects them.
Explore →Server response and delivery (TTFB)
Before any of the above, your server has to respond in the first place. How fast it answers, your hosting, and how the page's files are delivered set the ceiling on everything else, and it is often where the quiet, built-in waste sits.
Explore →The render path: images, fonts and scripts
How the browser puts the page together decides what a visitor is left waiting for. We shrink and modernise images, control how the text loads, and hold back or remove the background code that stops the page appearing quickly.
Explore →Monitoring so it does not regress
Speed slips as sites change. A new page design, tracking tag or embedded widget can quietly undo months of work, so we keep watching the real-world data and flag any slide backwards before it costs you rankings or sales.
Explore →Want core web vitals and site speed handled by the people who actually do the work?
Book a call →How does core web vitals and site speed work, step by step?
Start with the field data
We look at the real figures from your visitors, the data Google collects from real people rather than a one-off lab test, so we fix what people actually experience instead of chasing an artificial score.
Diagnose the true cause
A slow-appearing page can have a dozen causes. We pin down the one actually costing you on your real pages, not the generic advice a tool spits out.
Fix at the source
Images, text, background code, how the page is put together, and your server's speed, all tackled in the code and the way the page is delivered. No plugin bolted on to hide the problem from the test.
Resolve stability and interactivity
We set aside space for anything that would otherwise jump around, and rein in the background code that makes the page slow to respond, so it feels fast and stays still under a real thumb.
Verify against real users
We confirm the improvements show up in the real-world visitor data over the following weeks, not just in a lab test on the day, because that real-world data is what Google and your customers actually experience.
Monitor and hold the line
We keep measuring speed over time and flag any slide backwards early, so a new page design or marketing tag does not quietly undo the work.
Real people doing the work, and putting their name to it.
You deal with our small, experienced Bristol team directly, from the first call to every monthly report.
Meet the team →Are we the right fit?
Almost nobody scrolls past the top of the results.
These are industry figures, not our own results, and we do not invent numbers. They show why the first result is worth a multiple of the tenth, and why a site that cannot be found simply is not in the running. No ranking is ever guaranteed.
“The guys at BrisTechTonic are great - friendly and always helpful. I would highly recommend!”
Allanah Fenwick
Site-speed work is where corners get cut most often, because a plugin can flatter a lab test in an afternoon while the real experience barely changes. We do the opposite: we start from the data Google collects on your actual visitors, fix the real causes in the code and delivery, and check the improvements show up for real people over time. It is slower and needs more experience than the plugin route, and it is the only version that moves sales as well as scores.
Meet the team →Core Web Vitals and site speed, with the numbers.
Real people on your account, not a faceless agency.
You work directly with the senior people who do the work, a small Bristol team you will actually get to know, not a call centre or an account manager relaying messages.
Meet the team →
What clients say about working with us.
“I've had the pleasure of working with Chris on several SEO projects for my websites in the health field. He was definitely been able to demystify things so that I felt able to make decisions with him and feel confident they were the right ones. For a non-techie, that is worth gold! I look forward to working with Chris again and warmly recommend him to anyone who - like me - is unsure about all things SEO.”
“I was recommended by my branding partner to use Chris and his team last year. I can’t recommend them highly enough. They are very responsive , easy to communicate with and great at translating techy stuff when needed. They are now an essential part of my business model”
“We've been working closely with Chris, Hannah and the team for over 12 months now. As a small company with ambitious growth plans, it was incredibly important that we made the right choice on who to trust with our SEO. 18 months later, we're totally thrilled with our experience so far and our growing online presence within our market. We'd happily recommend BTT and their services to other SMEs. Drop them an enquiry!”
Thinking of switching from another agency?
Moving your core web vitals and site speed to us is more straightforward than staying somewhere that is not working. You keep everything you already own, we pick up without a gap, and we can run the whole thing for you or work alongside your team and your developers, whatever suits.
A free look first
We review what your current agency has done, tell you straight what is worth keeping and where the quick wins are. No obligation to move.
You keep what's yours
Your site, content, Google Business Profile and analytics stay in your name. We work with what you already have; nothing is held hostage.
A clean handover
We map the work across, set a plain-English baseline in the first few weeks, and carry on from there. No starting from zero, no quiet ranking gap.
Three-month minimum, then rolling monthly on 30 days’ notice. No long lock-in, no exit fees.
How much does core web vitals and site speed cost?
All + VAT · 3-month minimum, then 30-day rolling| What's included | Lite £299 + VAT / month | Max Most chosen £449 + VAT / month | XL £849 + VAT / month | Custom Contact us |
|---|---|---|---|---|
| Technical & on-page SEO | ✓ | ✓ | ✓ | ✓ |
| AEO / AI-search layer (found in ChatGPT, AI Overviews) | ✓ | ✓ | ✓ | ✓ |
| Local map-pack optimisation | ✓ | ✓ | ✓ | ✓ |
| Page creation | ✓ | ✓ | ✓ | ✓ |
| Blog posts / month | Add-on | Add-on | 2 | Tailored |
| AI Authority building | — | — | ✓ | ✓ |
| Plain-English monthly report | ✓ | ✓ | ✓ | ✓ |
| Best for | Getting the foundations right | Competing on your key terms | Going after it hard, incl. AI authority | Shaped around your goals |
Before you get in touch.
Are Core Web Vitals a ranking factor?
Yes, part of Google's page-experience signals, and beyond ranking, speed and stability directly affect conversion, so the work pays twice.
Won't a caching plugin fix it?
It usually improves the lab score without improving the real experience. Genuine gains come from fixing the source: images, scripts and the render path.
How much can speed actually improve?
It depends on the starting point, but most sites carry significant, fixable waste. The field data tells us what is realistic before we start.
Does site speed help with AI assistants?
Indirectly. A fast, cleanly-rendered site is easier for crawlers and assistants to read, so the performance work supports being cited as well as ranked.
What is a good Core Web Vitals score?
Google sorts pages into good, needs improvement and poor for each of the three measures, based on data from real visitors. The aim is good across all three on the pages that matter to your business, but the honest starting point is your own visitor data, which tells us what is realistic before we commit to anything.
Do Core Web Vitals matter on mobile more than desktop?
Mobile usually matters more, because that is where most visitors are and where slow connections and older phones expose problems a fast laptop hides. Google mainly judges the mobile experience, so that is where we focus first while keeping the desktop version solid.
We are on Shopify or WordPress. Can you still fix this?
Yes. The platform sets some limits, but there is almost always real, fixable waste in images, background code, themes and add-on apps or plugins. We work within what the platform allows rather than pretending the limits are not there, and we are clear about where a limit is genuinely built in.
Will a faster site actually increase sales, or just rankings?
Both, and the conversion side is often the larger prize. Speed and stability affect whether a visitor stays and buys regardless of where you rank, which is why fixing the source pays twice rather than once.
How long before we see the numbers move?
Fixes can be made quickly, but Google's real-visitor data covers a rolling stretch of recent visits, so the reported scores update over a few weeks rather than overnight. We check against that real data rather than declaring success on the day of a lab test.
Is this the same as a technical SEO audit?
It overlaps but is not the same. Core Web Vitals is the speed-and-loading part; a wider technical audit also covers whether Google can find, list and read your pages, plus the site's structure and more. If speed turns out to be one symptom of a bigger problem, we will say so and point you to the right piece of work.
What if fixing this needs our development team?
Often it does, and we are set up to work that way. We work out the cause, hand your developers clear, ordered tasks with the exact change and the reason for it, and we make changes directly where the platform allows and you would rather we did. Where a fix sits in a system we do not control, a custom-built application, an add-on plugin or a part your own engineers look after, we say so plainly and work alongside your developers or a specialist rather than pretend it is ours to change on our own.
Read the full breakdown of core web vitals and site speed
Core Web Vitals are three things Google measures about how a page actually behaves for a real person: how quickly the main content appears, how fast the page reacts when someone taps or clicks, and how much it jumps around while it loads. Google has technical names for these, but in plain terms they come down to speed and steadiness. They matter because Google takes them into account, and because they line up almost exactly with how a customer judges a site in the first few seconds. A page that loads fast and stays still feels trustworthy. A page that stalls, then shoves a button under a moving thumb, loses the sale before anyone reads a word.
The commercial case is simpler than the acronyms suggest. Slow, unstable pages lose conversions whether or not they lose rankings, so the work pays twice: it protects the position you hold in search and it protects the revenue from the traffic you already have. That second half is the part most speed projects ignore, because a lab score is easy to move and a real user's experience is not.
We do this differently by refusing the shortcut. Most speed fixes are only skin-deep: a plugin that flatters a lab test while the real page still drags a huge image, a script that holds everything up, and text that arrives late. We work from real-world data first, the figures from your actual visitors on their actual phones and laptops, and then fix the real causes in the code and the way the page is delivered. That is harder and slower to do well, which is exactly why it moves both the figures and the money instead of just the number on a screenshot.
This takes real experience. Working out why a page is slow, and picking which of the twenty possible causes is the one actually costing you, is judgement built over years, not a checklist someone junior runs. Experienced people do the work, and the honest starting point is always the same: run your site through Google's free PageSpeed check, look at the real-world data, and decide what is realistic before anyone promises anything.