Core Web Vitals: The Speed Playbook for Ecommerce
How Hepek engineers fast storefronts that pass LCP, INP, and CLS, and turn speed into rankings and revenue.
Slow stores lose rankings and revenue
Speed is not a vanity metric in ecommerce, it is a direct line to your bottom line. Google measures the real experience of your shoppers through Core Web Vitals and factors them into search rankings, so a slow storefront quietly loses visibility to faster competitors. It also loses buyers: research consistently shows that shoppers abandon pages that take more than a few seconds to load, and even small delays measurably depress conversion. The trouble is that most stores accumulate speed debt over time, heavy hero images, bloated third-party scripts, render-blocking fonts, and layout that jumps around while it loads. Each one chips away at the loading, responsiveness, and stability that determine whether a visit becomes a sale, across every market you serve from the USA to Europe, the Gulf, and the Nordics.
A storefront engineered to pass all three vitals
Hepek treats performance as an architecture decision, not a post-launch patch. We build server-rendered storefronts where the largest content paints fast, interactions respond instantly, and the layout stays visually stable as it loads, so your store passes all three Core Web Vitals at the 75th percentile of real visitors. That means an LCP under 2.5 seconds, an INP under 200 milliseconds, and a CLS below 0.1. We get there with disciplined image optimization, code-splitting that ships only the JavaScript a page needs, a smart font strategy, aggressive caching, and a global CDN that serves your store from close to the shopper wherever they are. Then we measure with real field data, not just lab scores, so the speed we ship is the speed your customers actually feel.
Kako funkcioniše
- 1
Baseline with field and lab data
We start by measuring what your real shoppers experience using field data from the Chrome User Experience Report, which is the source Google uses for rankings, then reproduce the problems in the lab with Lighthouse and profiling tools. Field data tells us what to fix, lab data tells us why, so we optimize for real users instead of chasing a synthetic score.
- 2
Optimize the largest paint (LCP)
We attack Largest Contentful Paint directly, serving hero and product imagery in modern formats like AVIF and WebP, sizing them responsively, and preloading the critical image. Combined with server-side rendering and fast first-byte delivery, this reliably brings the main content under the 2.5-second target that defines a good LCP.
- 3
Trim and split JavaScript (INP)
Sluggish interactions come from too much JavaScript blocking the main thread. We code-split so each page ships only the code it needs, defer non-critical scripts, and break up long tasks, so taps on add-to-cart, filters, and menus respond in under 200 milliseconds, the threshold for a good Interaction to Next Paint.
- 4
Eliminate layout shift (CLS)
We reserve explicit space for every image, ad slot, banner, and embed so nothing jumps as the page loads, and we load fonts without the flash of unstyled text that reflows content. The result is a Cumulative Layout Shift under 0.1, so shoppers never mis-tap because a button moved under their finger.
- 5
Cache aggressively and serve from a global CDN
We cache static assets and rendered pages, and distribute them through a global CDN so your store loads from an edge close to the shopper, whether they are in Texas, Berlin, Doha, or Stockholm. Edge delivery and long-lived caching cut latency and keep vitals green under real-world traffic and peaks.
- 6
Guard performance with a budget
We set a performance budget and wire vitals monitoring into your workflow so regressions are caught before they reach shoppers. Every new feature, script, or design change is checked against the budget, which keeps the store fast long after launch instead of decaying release by release.
Tehnologija
LCP (Largest Contentful Paint)
Measures loading, the time until the largest visible element renders. Good is under 2.5 seconds. We tune imagery, server rendering, and delivery to hit it.
INP (Interaction to Next Paint)
Measures responsiveness, how quickly the page reacts to taps and clicks. Good is under 200 milliseconds. We get there by trimming and splitting JavaScript.
CLS (Cumulative Layout Shift)
Measures visual stability, how much the layout moves while loading. Good is below 0.1. We reserve space for media and fonts so nothing jumps.
Global CDN and edge caching
Serves your store from an edge location near each shopper across the USA, Europe, the Gulf, and the Nordics, cutting latency and keeping vitals green worldwide.
Field and lab measurement
Real-user field data from CrUX shows how actual shoppers experience the site at the 75th percentile, while lab tools like Lighthouse pinpoint the causes to fix.
Prednosti
Better search visibility
Core Web Vitals are a Google ranking signal. Passing all three helps your product and category pages compete for organic traffic instead of losing ground to faster stores.
Higher conversion
Faster loading and instant responsiveness keep shoppers from bouncing and reduce friction at every step, so more of the traffic you already have turns into completed orders.
Fast everywhere you sell
A global CDN and edge caching mean your store feels local and fast whether the shopper is in the USA, Europe, the Gulf, or the Nordics, not just near your origin server.
Speed that lasts
A performance budget and continuous vitals monitoring stop regressions before they ship, so your store stays fast release after release instead of slowly decaying.
Lower infrastructure strain
Aggressive caching and lean, code-split pages reduce server load and bandwidth, so your store handles launch spikes and seasonal peaks without buckling or ballooning costs.
Measured on real users
We optimize against field data from real shoppers, the same data Google uses, so improvements reflect what customers actually feel rather than a lab-only score.
Često postavljana pitanja
What are the Core Web Vitals thresholds?
There are three. Largest Contentful Paint (LCP) should be under 2.5 seconds, Interaction to Next Paint (INP) under 200 milliseconds, and Cumulative Layout Shift (CLS) below 0.1. A page passes only when it meets all three at the 75th percentile of real visitors, meaning at least three quarters of visits hit the good threshold.
Do Core Web Vitals affect SEO and rankings?
Yes. Core Web Vitals are part of Google's page experience signals and feed into search rankings, so a faster store can rank higher than a slower one for the same content. They are not the only ranking factor, but for competitive ecommerce categories, passing all three removes a disadvantage and helps your pages compete on speed as well as relevance.
What is the difference between field data and lab data?
Field data is measured from real shoppers using your store, collected by Google in the Chrome User Experience Report, and it is what counts for rankings. Lab data comes from synthetic tests like Lighthouse run in a controlled environment, which is ideal for debugging. Hepek uses field data to know what to fix and lab data to find the cause, then verifies improvements in the field.
How does page speed affect ecommerce conversion?
Speed directly influences whether a visit becomes a sale. Shoppers abandon pages that load slowly, and even small delays measurably reduce conversion, while instant responsiveness keeps buyers moving through search, product, cart, and checkout. Faster stores also retain mobile shoppers, who are the most likely to leave when a page stalls.
Which techniques improve Core Web Vitals the most?
The biggest wins come from image optimization in modern formats, code-splitting so pages ship only the JavaScript they need, a font strategy that avoids reflow, aggressive caching, lazy-loading below-the-fold content, and a global CDN. LCP usually improves with faster imagery and server rendering, INP with leaner JavaScript, and CLS by reserving space for media and fonts.
Can Hepek improve the vitals on my existing store?
Yes. Hepek audits your live store against real field data, identifies exactly where LCP, INP, and CLS fall short, and fixes the causes, whether that means image and font strategy, code-splitting, caching, or CDN delivery. We work with stores across the USA, Europe, the Gulf, and the Nordics. Email info@amygdal.com to get a performance audit started.
Ready for a store that passes every vital?
Hepek engineers fast ecommerce storefronts that hit LCP under 2.5s, INP under 200ms, and CLS under 0.1, measured on real shoppers and served worldwide from a global CDN. Tell us about your store at info@amygdal.com and we'll map your speed playbook.