E-commerce Site Optimization
Accelerate your online store to sell more
Is your e-commerce slow? Every lost second costs sales. Optimize the speed and conversion rate of your existing store.
Transformation
From slow to fast — the result of optimization
LCP
—INP
—CLS
—Speed, the number 1 lever of e-commerce
What I optimize on your store
E-commerce optimization acts on all the levers that hinder your sales: loading speed, smooth shopping journey, and performance perceived by the user.
⚡ Loading speed
Optimization of product images, CSS/JS, caching, and rendering for product sheets and category pages that display instantly.
🛒 Smooth shopping tunnel
Reduction of friction in the shopping journey: responsive cart, streamlined checkout steps, latency-free payment.
📱 Mobile performance
60% of your traffic is mobile. I specifically optimize the experience on smartphones: touch interactions, loading on 4G networks, page weight.
📊 Controlled third-party scripts
Tracking, widgets, and marketing scripts often weigh more than your site itself. I audit, optimize, or replace them to regain speed.
How much does a slow site cost you?
Revenue Impact Calculator
Estimate your monthly gain after web performance optimization
Current revenue / month
0 €Revenue after optimization
0 €+0.5% conversion
Estimated gain / month
0 €Source: WPO Stats — Correlation studies between web performance and conversion rates
How does the optimization process work?
A proven process for measurable results
Prioritization plan
Identification of quick wins and foundational projects, prioritized by impact on revenue and implementation complexity.
Iterative optimization
Implementation in batches with measurement of the impact of each optimization. Each change is validated before moving on to the next.
Results measurement
Comparison before/after on performance metrics and business KPIs: conversion rate, average cart value, bounce rate.
Prioritization plan
Identification of quick wins and foundational projects, prioritized by impact on revenue and implementation complexity.
Iterative optimization
Implementation in batches with measurement of the impact of each optimization. Each change is validated before moving on to the next.
Results measurement
Comparison before/after on performance metrics and business KPIs: conversion rate, average cart value, bounce rate.
Results observed on e-commerce stores
Measurable ROI or free intervention
If the optimization of your store does not improve your Core Web Vitals and your conversion rate within 30 days, I will work for free until we reach the goals set together.
What my clients say
Excellent work.
Paul has significantly improved the site's speed and perfectly aligned it with Google's recommendations.
Professional, thorough, and efficient, I highly recommend.
Nicolas - April Moto
Digital & E-commerce Director
We are very satisfied with Paul's work. He is quick, available, and particularly effective. Since his arrival, very good results have been observed, both in terms of performance and responsiveness. A real asset for our team.
Léo - Maison de luxe
E-commerce Product Owner
I don't know if we've said it enough.
But if you want to improve your loading speed,
Make Google happy and get your Core Web Vitals in the green,
Contact Paul Delcloy.
Florian Darroman - Les Makers
Co-founder
Complementary services
Creation of high-performing online stores, optimized for conversion and organic search.
Continuous monitoring of web performance: tracking Core Web Vitals, real-time alerts, and regression detection.
Technical maintenance, security, and performance monitoring for your e-commerce site. Updates, monitoring, and responsive support.
Frequently asked questions
My site is on Shopify/PrestaShop/Magento, can you optimize it?
How long does it take to see results?
Does optimization risk breaking functionalities?
What is the difference with classic site optimization?
Ready to boost your store's sales?
Why optimize the performance of your e-commerce?
Speed is the primary conversion factor on an e-commerce site. Studies confirm it: every additional second of loading reduces the conversion rate by 7%. On a store generating 100,000 euros in monthly revenue, a one-second gain potentially represents an additional 84,000 euros in annual revenue. This is not a marginal investment; it's a direct growth lever.
Beyond conversion, performance impacts organic search ranking. Google considers Core Web Vitals for search result rankings. A fast e-commerce site is better positioned, generates more organic traffic, and reduces its dependence on paid advertising campaigns.
The hidden cost of third-party scripts
On most online stores, third-party scripts weigh more than the site itself. Tracking analytics, ad pixels, chat widgets, recommendation tools, A/B testing scripts: each integration adds weight and network requests. A thorough audit of these scripts often allows for halving loading times without touching the site's code.
The approach is not to remove everything but to optimize: deferred loading, replacement with lighter alternatives, request grouping, and smart caching. The result is a site that retains all its marketing functionalities while regaining speed.
Optimize the purchasing journey
The conversion funnel is the most sensitive area of your e-commerce. From the click on "Add to Cart" to order confirmation, every latency, every visual hesitation, every screen that takes time to respond increases the risk of abandonment. Optimizing the purchasing journey focuses on interaction responsiveness (INP), visual stability (CLS), and loading speed at each step.
Optimizations include prefetching the next steps, reducing the weight of checkout pages, asynchronous loading of payment methods, and removing non-essential scripts in the purchase funnel.
Measurable results, not promises
Each optimization is accompanied by before/after measurements, both on technical metrics (LCP, INP, CLS, page weight) and on business indicators (conversion rate, bounce rate, average cart value). This data-driven approach allows prioritizing optimizations based on their real impact on your revenue and demonstrating the return on investment of each intervention.