Web performance expert consultant

Turn milliseconds into millions

Your visitors deserve a flawless experience. By optimizing your website's performance, you improve your SEO, conversion rates, and user experience. I am the accelerator of your digital success.

Trusted by leading brands

CHANEL
DIOR
Decathlon
April Moto
SiriusXM
Make Up Forever
Camif
RIMOWA
Jimmy Fairly
Wecasa
Chronovet
CHANEL
DIOR
Decathlon
April Moto
SiriusXM
Make Up Forever
Camif
RIMOWA
Jimmy Fairly
Wecasa
Chronovet
0

Overall score

Google PageSpeed Insights

Poor
Load time Slow
0s
Interactivity Slow
0ms
Conversion Low
0%
Bounce rate High
0%
SEO Penalized
1
2
3
Server time Slow
0ms
Services

My services

Offre phare

Web Performance Audit

The diagnosis of milliseconds that cost you (too) much

Complete audit of your site's web performance: identification of bottlenecks, analysis of Core Web Vitals, and prioritized recommendations.

  • Field and lab Core Web Vitals diagnostic
  • Front-end, back-end and CDN bottleneck mapping
your-site.com
!
JS
!
!
3P
!
Overall score
—
Core Web Vitals
LCP —
INP —
CLS —
Issues detected
0

Web Performance Optimization

E-commerce store, corporate site, or media: enhance your UX to increase your conversion rate with a web performance consultant integrated into your teams.

Support for optimizing the speed and user experience of your website, e-commerce, or corporate site.

  • Implementation of the priority levers
  • Front-end tuning: LCP, INP, code splitting
  • Back-end & infra tuning: cache, CDN, database
LCP CLS

Web Performance Monitoring

Detect regressions before your users do with continuous monitoring of your Core Web Vitals and performance metrics.

Continuous monitoring of web performance: tracking Core Web Vitals, real-time alerts, and regression detection.

  • 24/7 Core Web Vitals monitoring
  • Slack or email alerts on regression
  • Custom real-time dashboard
A full-stack approach

Optimizations across dozens of technologies

Angular
Angular
Astro
Astro
Drupal
Drupal
Laravel
Laravel
Python
Python
React
React
Salesforce Commerce Cloud
Salesforce Commerce Cloud
SAP Commerce Cloud
SAP Commerce Cloud
Sylius
Sylius
Symfony
Symfony
Akamai mPulse
Akamai mPulse
Datadog
Datadog
Dynatrace
Dynatrace
SpeedCurve
SpeedCurve
Akamai
Akamai
Cloudflare
Cloudflare
Fastly
Fastly
Magento
Magento
Prestashop
Prestashop
Shopify
Shopify
Wordpress
Wordpress
Medusa.js
Medusa.js
Ruby on Rails
Ruby on Rails
Angular
Angular
Astro
Astro
Drupal
Drupal
Laravel
Laravel
Python
Python
React
React
Salesforce Commerce Cloud
Salesforce Commerce Cloud
SAP Commerce Cloud
SAP Commerce Cloud
Sylius
Sylius
Symfony
Symfony
Akamai mPulse
Akamai mPulse
Datadog
Datadog
Dynatrace
Dynatrace
SpeedCurve
SpeedCurve
Akamai
Akamai
Cloudflare
Cloudflare
Fastly
Fastly
Magento
Magento
Prestashop
Prestashop
Shopify
Shopify
Wordpress
Wordpress
Medusa.js
Medusa.js
Ruby on Rails
Ruby on Rails
Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails Angular Astro Drupal Laravel Python React Salesforce Commerce Cloud SAP Commerce Cloud Sylius Symfony Akamai mPulse Datadog Dynatrace SpeedCurve Akamai Cloudflare Fastly Magento Prestashop Shopify Wordpress Medusa.js Ruby on Rails
Testimonials

What my clients say about my services

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 - Luxury brand

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

Web Performance Expert

A dedicated expert for your website performance

Over 8 years of web optimization experience. Audit, optimization and monitoring: a comprehensive approach for measurable results.

A complete technical audit

Every engagement starts with a thorough diagnosis. Core Web Vitals analysis, network waterfall, bottleneck identification – for an impact-prioritized action plan.

  • ✓ Core Web Vitals analysis (LCP, INP, CLS)
  • ✓ Network waterfall and bottleneck identification
  • ✓ Action plan prioritized by impact and effort
your-site.com
!
JS
!
!
3P
!
Overall score
—
Core Web Vitals
LCP —
INP —
CLS —
Issues detected
0

Optimization Checklist

Actions identified during the audit

0/17

applied

Image optimization Images
JS bundle reduction JS
Server compression Server
Cache strategy Server
Font optimization Fonts
Split product page CSS into pdp.css CSS
+12 more optimizations

Hands-on optimization

I don't just recommend: I implement. Page weight reduction, Critical Rendering Path optimization, elimination of render-blocking resources – every millisecond gained translates into better conversion rates and SEO rankings. I work directly in your codebase, across all layers: front-end, back-end, infrastructure.

  • ✓ JavaScript and CSS bundle reduction
  • ✓ Image optimization and modern formats
  • ✓ Cache and CDN strategy

Every intervention is documented and measured. You track your metrics in real time, with before/after data on each optimization.

Measurable and lasting results

The goal isn't a one-time Lighthouse score, but real, lasting performance measured on your actual users via CrUX data.

  • ✓ Green Core Web Vitals on all pages
  • ✓ Better SEO rankings and optimized crawl budget
  • ✓ Higher conversion rates, lower bounce rates

Core Web Vitals

0.0s

LCP

Good

0ms

INP

Good

0.00

CLS

Good

Web performance advices

Latest articles

TTFB: what is the Time to First Byte and how to optimize it?
Performance Serveur
TTFB: what is the Time to First Byte and how to optimize it?

TTFB (Time to First Byte) measures the delay between an HTTP request and the first byte of response received by the browser. Google targets < 800 ms in field data (P75). The most common causes: no page cache, cache dilution from query parameters, unoptimized database queries, no CDN. On an SFCC e-commerce site, cache key normalization reduced dilution by 80% and brought Server Response from 0.74 s to 0.63 s (−15%) in field data.

Google Lighthouse: complete guide to auditing your website
Performance Outils
Google Lighthouse: complete guide to auditing your website

Master Google Lighthouse from A to Z: installation, key metrics, score interpretation, tool limits, and real-world web performance case studies.

WebPageTest vs PageSpeed Insights: complete comparison
Web Performance Outils
WebPageTest vs PageSpeed Insights: complete comparison

WebPageTest vs PageSpeed Insights: lab data vs field data, diagnostics vs SEO signal. Comparison, use cases, scripting, API and ecosystem.

View all articles
Support

Un accompagnement web performance complet, en direct

Audit Core Web Vitals, mise en œuvre technique, monitoring continu et formation. Le périmètre complet d'une mission web performance, livré par un consultant expert indépendant.

8+ Years of experience
35+ Clients supported
48h Average response time
100% Dedicated to performance

Revenue Impact Calculator

Estimate your monthly gain after web performance optimization

50 000
2.5%
$85

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

For over 8 years, I've been helping companies of all sizes optimize their web performance. Whether you need an expert or a web performance agency, the choice depends on your context – but technical expertise remains the key factor. :article_linkLearn how to choose the right partner:article_end for your optimization projects.

Références

Ils m'ont fait confiance

Une partie des missions menées ces dernières années. Pour chacune : périmètre, stack, et résultats mesurables.

CHANEL

2022 → 2026

Web Performance Architect

Audits across all global markets (APAC, EMEA, AMER, CN, JP), embedded in internal technical teams.

SAP Hybris ReactJS Akamai Cloudinary Dynatrace SpeedCurve
  • Checkout reduced from 12 s to under 2 s
  • 80 % of visits rated as fast on Google CrUX
  • TBT (Total Blocking Time) reduced by 40 %
  • TTFB reduced by 20 %

RIMOWA

2024 → present

Web Performance Consultant

Worldwide audits (APAC, EMEA, AMER, JP), performance roadmap, code reviews, delivery follow-up.

SFCC Akamai SpeedCurve
  • 95 % of users with an excellent experience on CrUX
  • TTFB reduced by 46 %
  • Perfect CLS across the entire site
  • Performance budgets defined, technical and business impact tracked

SiriusXM

2025 → present

Web Performance Consultant

Audits on the web platform and marketing sites. Custom reporting through synthetic and real-user monitoring.

React.js Next.js Angular Akamai Datadog SpeedCurve
  • 82 % of users with a good experience on CrUX
  • Continuous follow-up of the performance roadmap
  • Optimisations implemented hands-on inside the product codebase
FAQ

Frequently Asked Questions

What is web performance?

Web performance (or WPO) is the art of providing fast display and good fluidity of web pages in browsers. During their loading and throughout their use, the pages of the website must load following a set of precise best practices. For a complete definition, check out the web performance definition.

Why call on a web performance expert?

Web performance is a new and complex field in web development. Profiles of web performance consultants are rare in the market and possess a comprehensive skill set in communication, UX, front-end and back-end development to best integrate into your technical teams.

Your teams certainly do not have the time to conduct web performance audits of your site or to test the speed of its pages. That’s why it is beneficial to delegate this essential part of your site's conversion (which contributes to SEO ranking) to a web performance agency or an expert in the field.

Who is web performance for?

Web performance speaks to both the bots and the users of your site. Google has been encouraging good performance since 2021 with its Core Web Vitals Update. From a user perspective, a fast site is one that exudes quality and can reflect the quality of your brand. Some case studies, like those from Amazon, correlate loading time with the conversion rate of their online store.

What technologies do you work with?

Originally a full-stack developer, I am capable of optimizing both front-end and back-end performance. My advantage over other performance web agencies is my mastery of tools like Dynatrace or Datadog for identifying code optimization opportunities on the server side. On the client side, I work with all types of front-end stacks (React, VueJS, Astro, HTML / CSS / JS, ...) and mobile.

How to test the performance of my website?

Multiple tools allow you to see the performance of the website. On Google PageSpeed, a bot is sent to your site, which will return a score out of 100 points. Other tools like Dareboost or GT Metrix also provide synthetic testing.

Contact me for a quick and free assessment of your performance as well as that of your competitors.

What is the price of a web performance optimization?

Depending on your needs, the size of your technical team, or the availability of your agency, I can offer you tailored support that matches your requirements and is suited to your business. The audit generally starts at €1500 excluding tax.

Ready to boost your performance?

Dedicated web performance expert
Immediate availability
8+ years of experience
100% satisfied clients
Data 2023-2026