Services · Performance SEO
Performance SEO that pays
for itself in conversions.
A slow page leaks revenue on every single visit, whatever position it holds in the results. A slow site also spends its crawl budget on waiting, so the pages you publish get discovered late. We fix the second problem while we are fixing the first.
/collections/best-sellers
- Largest Contentful Paint faster
- Interaction to Next Paint faster
- Cumulative Layout Shift steadier
- Time to First Byte
The metrics we move and the systems behind them
- Core Web Vitals
- Largest Contentful Paint
- Interaction to Next Paint
- Cumulative Layout Shift
- Crawl Budget
- Render Path
- Image Delivery
- Server Response
Our Performance SEO strategy
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01
Measure real visits
Field data from the devices your buyers actually hold, because a lab score on a fast laptop hides what a phone on mobile data sees.
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02
Fix the origin first
Server response and caching come before front end tuning, since every other metric only starts counting after the first byte arrives.
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03
Shorten the critical path
Fewer render blocking requests, lighter media and less JavaScript standing between the request and the first useful paint.
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04
Hold the line
Performance budgets wired into your release process, so next quarter’s deployment does not quietly undo the work.
Performance SEO is the technical discipline of making a website load, respond and settle quickly enough that visitors convert and search engines can crawl everything it publishes. It sits on the same foundation as organic SEO, and it is judged by Core Web Vitals, server response time and crawl efficiency rather than by keyword positions.
Speed is a conversion problem before it is a ranking one.
Most agencies sell speed as a way to rank. That is the weakest part of the case. The money sits in the visits you already have and in the pages a crawler never gets around to fetching.
You pay for the wait at checkout
Abandonment climbs as pages get slower, and it climbs at every step of the funnel rather than only at the last one. The traffic already arrived and was already paid for, which makes this the cheapest revenue in the building.
Slow sites get crawled less
Search engines throttle how hard they fetch a host that responds slowly or starts erroring under load. Fewer fetches per visit means new products, new articles and new fixes all queue behind each other before anyone sees them.
The ranking effect is real and small
Google has been open that page experience acts more like a tie-breaker than a heavyweight signal. We will not pretend otherwise. Speed decides close calls between comparable pages, and it decides what happens after the click.
The metrics, and what actually breaks them
Core Web Vitals are named measurements with defined behaviour. Knowing which one moved tells you which part of the stack to open, which is why we report by metric rather than by a single blended score.
| Metric | What it measures | What usually breaks it |
|---|---|---|
| Largest Contentful Paint | How long until the largest visible element in the viewport finishes rendering, which is normally a hero image, a video poster or a block of heading text. | A slow origin response, render blocking CSS and JavaScript, lazy loading applied to the hero image, and uncompressed media served at desktop dimensions to phones. |
| Interaction to Next Paint | The delay between someone interacting with the page and the browser painting the next visual update. It replaced First Input Delay as a Core Web Vital in 2024. | Long JavaScript tasks holding the main thread, expensive event handlers, hydration on framework pages, and third party tags that run on every click. |
| Cumulative Layout Shift | How much visible content jumps position without the user causing it, measured across the life of the page rather than only during load. | Images and iframes with no width and height, fonts that swap in late, and banners, consent bars or promo strips injected above content that is already on screen. |
| Time to First Byte | How long your server takes to send the first byte of the document after the request reaches it. Every other timing starts from here. | Uncached database queries, redirect chains, plugin weight on the origin, shared hosting under pressure, and a CDN that is missing more often than it hits. |
| Crawl budget | How many URLs a search engine is willing to fetch from your host in a given period, and how much of that allowance reaches pages you care about. | Slow or unstable responses, faceted navigation generating endless URL combinations, soft 404s, and near duplicate pages absorbing fetches that belonged elsewhere. |
Who this is for
Performance work pays back fastest where traffic is already arriving, where the catalogue is large, or where a framework has quietly put a JavaScript layer between your content and everything that reads it.
Ecommerce with traffic it is not converting
Category and product pages carry the heaviest media on the site and usually the most third party script. If sessions look healthy while the basket rate does not, the load experience on a mid range phone is the first place we look.
Large catalogues and publishers
Once a site runs to tens of thousands of URLs, crawl efficiency stops being theoretical. Slow responses and wasted fetches mean new stock and new articles sit undiscovered while stale pages get recrawled for no reason.
Sites that rank well and still underperform
You hold good positions, impressions hold up, and the revenue does not follow. When the organic SEO work is already sound, the gap is usually between the click and the page becoming usable.
Anyone rebuilt on a heavy front end
Client rendered pages can look fine in a browser and arrive nearly empty to a crawler. Many of the bots feeding LLM SEO visibility skip JavaScript entirely, so what you ship in the HTML is what they get to read.
How our Performance SEO process works
Six steps, run in this order for a reason. Each one either removes work from the browser or removes waiting from the network, and every one of them produces something you can inspect.
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1
Baseline from real users
We pull field data for your key templates alongside lab traces, then split it by device and connection. A desktop score tells you very little about the phone your customer is holding.
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2
Trace the critical path
We map every request that stands between the click and the first useful paint, then mark which ones are genuinely required and which ones are there because nobody ever removed them.
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3
Fix the server response
Caching layers, database queries, redirect chains and CDN configuration. Front end tuning on top of a slow origin buys you very little, so this comes before the pretty work.
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4
Media and font delivery
Modern formats, correct dimensions per breakpoint, explicit width and height attributes, sensible preloading of the hero asset and font loading that stops text jumping when the file lands.
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5
JavaScript and third party tags
We break up long main thread tasks, defer what can wait and audit every tag against what it earns. Tag managers accumulate scripts that nobody in the business still uses.
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6
Budgets and monitoring
Performance budgets wired into your build, plus ongoing field monitoring, so a regression shows up in a report during the sprint that caused it.
What you actually receive
Engineering output your developers can act on, handed over in a form your team keeps using after the engagement ends.
The performance baseline
- Field and lab results for every key template
- Results split by device class and connection
- The same measurements taken for named competitors
A prioritised fix list
- Each issue tied to the metric it damages
- Effort, owner and expected direction of travel
- Code level notes your developers can implement from
Shipped changes
- Server, caching and delivery configuration applied
- Templates corrected for layout stability and media weight
- Before and after traces for every change we make
Guardrails that outlast us
- Performance budgets enforced in your build pipeline
- Field monitoring with alerting on regressions
- Crawl statistics reviewed against the fixes shipped
“We started with a free strategy that showed us specific gaps in our campaigns. Today, LineUp is our regular partner, delivering a measurable return on every invested zloty.”
What clients say on Google
Unedited screenshots from our Google Business Profile. Swipe, or use the arrows, to read them all.
Read these reviews on Google. Reviews written in Polish or Turkish are shown in Google’s own translation.
Questions we get asked
What is Performance SEO?
Performance SEO is the technical discipline of making pages load, respond and settle quickly enough that visitors convert and crawlers can reach everything you publish. It covers Core Web Vitals, server response time, rendering behaviour and the crawl efficiency of the site as a whole.
Are Core Web Vitals a ranking factor?
Yes, though a modest one. Google has described page experience signals as closer to a tie-breaker than a heavyweight ranking input, and strong content on a slow page still beats thin content on a fast one. The stronger commercial argument for speed is conversion.
What is Interaction to Next Paint?
Interaction to Next Paint measures how long a page takes to show a visual response after someone taps, clicks or presses a key. It replaced First Input Delay as a Core Web Vital in March 2024, because it judges the whole interaction instead of only the first one.
Does this help how AI assistants see us?
Often, yes. Many crawlers that feed language models fetch raw HTML and skip JavaScript, so anything painted client-side may never be read at all. Render and response fixes support LLM SEO for the same reason they support Google, so the work is shared rather than duplicated.
Do we need a rebuild to fix our speed?
Usually not. Most of what we find comes from render blocking scripts, unoptimised images, missing caching and a slow origin response, and all four are fixable in place. If a rebuild genuinely is the cheapest route to a fast site, we will say so in the audit with the reasoning attached.
How does site speed affect crawl budget?
Every fetch a search engine makes has a cost on their side. When your server responds slowly or returns errors under load, the crawler backs off and takes fewer URLs per visit, so new and updated pages wait longer to be discovered. Large sites feel this first.
Find out what your load time is costing you.
We will measure your key templates on real devices, show you which metric is failing and which part of the stack is responsible, and rank the fixes by what each one is worth. No commitment attached.
Last reviewed 28 July 2026.