Website Performance

Improve website performance and Core Web Vitals.

A slow site loses rankings and revenue at the same time. We diagnose what is dragging your pages down and engineer the fixes, from render-blocking scripts to image weight to app bloat.

Speed is a conversion lever and a ranking factor.

Page speed is not a vanity metric. Google uses Core Web Vitals as a ranking signal, and every extra second of load time measurably drops conversions. A fast site is one of the few changes that helps SEO and revenue in the same move.

We start with a real diagnosis using Lighthouse, PageSpeed Insights and field data, then fix the actual bottlenecks: render-blocking JavaScript, oversized images, layout shift, slow servers and the app bloat that quietly accumulates on Shopify and WordPress. Then we measure again and prove the gain.

How we work

What you actually get

Core Web Vitals

We target LCP, INP and CLS directly, the metrics Google actually ranks on and users actually feel.

Real bottleneck fixes

Code splitting, lazy loading, image optimization and script deferral, not generic plugin band-aids.

SEO upside

Faster pages are easier to crawl, render and rank. Performance work pays back in both traffic and conversions.

Measured before & after

We benchmark with lab and field data so the improvement is provable, not just a feeling.

The process

How an engagement runs

1

Diagnose

A full audit with Lighthouse, PageSpeed Insights and Chrome UX field data to find what is really slowing you down.

2

Prioritize

We rank fixes by impact on Core Web Vitals and effort, so the heaviest wins land first.

3

Engineer fixes

We fix render-blocking resources, image weight, layout shift, caching and app bloat at the code level.

4

Verify

We re-measure lab and field metrics and hand you a clear before-and-after on every Core Web Vital.

Verified CRO Wins

Real tests. Real significance.
Client names withheld.

These are live A/B test results from our CRO program, measured with Intelligems. The numbers are real. The brands are agency-partner and white-label clients, so we describe them but never name them.

DTC cookware brand, EU 91% sig

Sticky add-to-cart on product pages

+25.3%
Conversion rate
+21.1%
Revenue / visitor
Home & garden brand, EU 96% sig

Volume discount display on PDP

+13.5%
Conversion rate
+20.7%
Revenue / visitor
Home & garden brand, EU 86% sig

Quantity selector badge on PDP

+5.8%
Conversion rate
+8.7%
Revenue / visitor
Home & garden brand, EU 88% sig

Above-the-fold product page redesign

+6.9%
Conversion rate
+5.2%
Revenue / visitor
Nordic home brand, EU Winning

Product trust tags on PDP

+13.2%
Conversion rate
+10.8%
Revenue / visitor
Minimalist homeware brand, EU Winning

Trust section on product pages

+38.0%
Revenue / visitor

Every winner is measured to statistical significance in Intelligems before we count it - and before we bill on performance. Results shown are per-variant lift over control.

We work under NDA, so brand names stay masked. The numbers are from real A/B tests, and we walk you through the full reports on a discovery call.

FAQ

Common questions

Why does website performance matter for SEO?

Google uses Core Web Vitals (LCP, INP, CLS) as ranking signals, and faster pages are crawled and rendered more reliably. Speed also lifts conversions, so it improves both rankings and revenue at once.

What are Core Web Vitals?

Core Web Vitals are three Google metrics: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability). We optimize all three directly.

Can you speed up a slow Shopify store?

Yes. Shopify slowdowns usually come from app bloat, heavy themes and unoptimized images. We trim and re-engineer those without breaking the store, then verify the gain in field data.

How much faster can my site get?

It varies by starting point, but stores with poor scores often move from failing to passing Core Web Vitals. We benchmark before and after so the improvement is measured, not promised.

Do faster pages really increase sales?

Consistently, yes. Industry studies and our own tests show conversion rates drop as load time climbs, so cutting seconds off load is one of the most reliable conversion levers available.

Make your site fast enough to rank and convert.

Book a 30-minute performance call. We will run your site live and show you exactly which Core Web Vitals are costing you traffic and sales.

Book a Performance Call