Should we prioritize optimization or an audit?

It depends on the maturity of your development teams . If the tools and stack are perfectly mastered, you can choose an audit rather than optimization by us. If this is not the case, we advise you to rely on our experience for us to carry out the identified modifications on your site ourselves.

How long does optimization take?

Allow for three to four days of work , spread over two to four weeks depending on your availability and production cycles. Technical alignment and tracking implementation kick off the project, and the intervention report closes it. The schedule primarily depends on your deployment pipeline. On a site where we work directly, fixes are applied on the fly; when they go through your teams and testing environments, the timeline follows your delivery pace , not ours.

Web performance optimization by experts

Q: Why do web performance optimization?

Performing performance optimization allows you to solve concrete problems on your site, those that impact your loading times, and therefore user experience and SEO visibility. It is the easiest way to correct them quickly and sustainably if you do not have internal development teams or a dedicated provider.

Q: How much does web performance optimization cost?

Web performance optimization costs between €1,500 and €3,500 excl. tax , depending on the complexity of your stack and the number of templates concerned. This is a fixed-price package, which includes three to four days of analysis and deployment of fixes on your site.

Don't let performance issues degrade your online visibility!

Our web performance experts work on your site to deploy targeted fixes

Better user experience

Who, tired of waiting for a page to load and remaining stubbornly white, has never hit the browser's 'back' button? Meeting your visitors' or prospects' expectations in terms of speed and responsiveness means ensuring they spend more time browsing your site, whether on mobile or desktop. All you have to do is focus on your mission: offering them the content they expect.

Increased conversion rates

For e-commerce stores using WooCommerce, MFA (Made For Advertising) sites, and those whose business model relies on converting visitors into leads or orders, web performance plays a crucial role. The conclusions of several serious studies converge in one direction: every millisecond gained means increased revenue. The same applies to ads like AdSense, Taboola, etc.

Improved SEO visibility

The impact of loading times on Google SERP rankings was debated for a long time. The 2021/2022 'Page Experience' algorithmic update clarified the situation: on mobile and desktop, the fastest sites benefit from a visibility boost compared to competitors of equivalent quality and relevance. This is particularly evident in Google Discover and the news carousel, but also more broadly in natural referencing.

Increased resilience and security

Web performance optimization allows you to align tools (theme and plugins) with the specific needs of your site. It’s an opportunity to do a major cleanup of your CMS, reducing the risks associated with security vulnerabilities and facilitating future updates of the core, theme, and extensions. It’s also an excellent way to decarbonize a site, meaning to reduce its carbon footprint.

Premium Support

With over 311 clients supported since 2022, Agence Web Performance has acquired a solid reputation in website optimization, regardless of their technical stack. Contact our teams to learn more about our solutions and boost your website’s potential.

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We optimize all technical stacks

A service in 4 key steps

Our performance optimizations are broken down into several key stages.

A video conference exchange as part of a service

Technical Alignment

We meet via video conference to discuss with your teams and discover your technical stack in detail. We review the identified issues, the steps already taken, and your web performance goals. This ensures a service that precisely meets your needs.

Tracking implementation

We place a tag on your site that collects performance data from your real users. This "RUM" data is used to precisely identify bottlenecks. Thanks to this data-driven approach, we operate with maximum visibility on your issues.

We deploy Lighthouse monitors on your key pages to provide you with a synthetic view of performance evolution. Launched every 8 hours, they allow us to quantify mobile and desktop gains. Practical for those who track Core Web Vitals metrics in a tool like PageSpeed Insights.

Site optimization

We audit your site and deploy the necessary fixes to improve detected weaknesses. This is done transparently, without interruption, and with lasting effects. Our methodology includes 120 checkpoints. It is a complex and highly specialized mission that can take up to 4 days.

Intervention Report

We meet a second time via video conference to present what has been deployed on your site. This is an essential exchange to ensure the sustainability of the optimizations. We also focus on the mobile PageSpeed Insights scores before and after the intervention.

What do our experts do, concretely?

Our experts work on four fronts: efficiently offload and serve static resources, prioritize what builds the first screen, remove render-blocking CSS, fonts, and JavaScript, and then address server-side bottlenecks. Each fix is deployed and then measured, never delivered based solely on best practices.

Static resource optimization

Our expert approach to front-end performance leads us to focus sharply on different types of resources: JavaScript, CSS, images, videos, fonts… Each of these can significantly degrade a web page’s performance, especially LCP.

Minification, combination, switching to modern formats, or implementing fallbacks are among the tools used in our optimization services. This operation requires advanced knowledge of best practices.

Prioritization of critical resources

Our experts use browser developer tools to identify blocking elements in the critical rendering path. The waterfall, or cascade loading diagram, is a key tool for understanding how a browser loads a web page.

Once loading issues are identified, we work on re-prioritizing key resources and de-prioritizing less important ones. This is a task that requires a detailed understanding of how browsers work, and which always proves very effective in improving Blocking Time and INP.

Reducing rendering times

One of the aspects of our optimization services consists of reducing the page rendering times by the browser. This is a complex process as it impacts the browser's CPU resource consumption, with effects that often affect several Core Web Vitals simultaneously.

We work in particular on page structure and DOM characteristics (the HTML code as it is used by browsers). Here again, we leverage the APIs and features integrated into browsers for immediate and lasting effectiveness.

Eliminating back-end bottlenecks

Server architecture and network infrastructure can strongly impact a site's performance, particularly on the TTFB side. Our experts' mission is to ensure that performance is as stable as possible regardless of upstream variations.

In addition to deploying a static HTML cache, our methodology leads us to optimize MySQL databases, implement an object cache, evolve server configuration, or implement optimal Resource Hints.

They entrusted us with the optimization of their site

You have a question?
We have the answer!

Consult the FAQ for more details on the service.

Performing performance optimization allows you to solve concrete problems on your site, those that impact your loading times, and therefore user experience and SEO visibility. It is the simplest way to correct them quickly and lastingly if you do not have internal development teams or a dedicated provider.

It depends on the maturity of your development teams. If the tools and the stack are perfectly mastered, you can choose an audit rather than an optimization by us. If this is not the case, we advise you to rely on our experience so that we can make the identified modifications on your site ourselves.

We perform optimizations on sites running on the most popular CMS: WordPress, PrestaShop, Drupal, Shopify, and Magento. We are also able to intervene on "custom" sites as long as they are not SPAs built in Angular or React (in which case, we audit them).

A web performance optimization costs between €1,500 and €3,500 excluding tax, depending on the complexity of your stack and the number of templates concerned. This is a fixed-price package, which includes three to four days of analysis and deployment of fixes on your site.

The gains depend on the starting point, but the orders of magnitude observed in our interventions are constant: 20 to 55% less TTFB and 40 to 65% less LCP. On the travel guide NYC.fr, TTFB decreased by 35% and LCP by 49%.

These technical gains translate into measurable business results, which are the real reason for optimizing. The same site saw its traffic increase by 18%, and Dartfish recorded 12% more qualified leads. On the Explore le Monde blog, affiliate revenue increased by 25% after a 55% decrease in LCP.

We never promise a figure before the analysis, for a simple reason: a site that is already correctly built offers less room for improvement than a site that has never been optimized. The initial technical alignment serves precisely this purpose, to estimate the real potential before committing to a scope.

Allow for three to four days of intervention, spread over two to four weeks depending on your availability and production cycles. Technical alignment and tracking implementation open the mission, and the intervention report closes it.

The schedule depends mainly on your deployment chain. On a site where we intervene directly, fixes are applied as they come; when they go through your teams and your testing environments, the delay follows your delivery rhythm, not ours.