Optimisation de la performance React, Angular et Single Page Apps

Don't let failing Core Web Vitals permanently penalize your online business!

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Specific "web application" expertise

Single-page applications often have classic performance issues affecting images, fonts, or stylesheets. However, the JavaScript aspect is more complex. Our webperf experts identify the bottlenecks slowing down critical phases like hydration and rehydration. The gains in rendering time and INP can be significant.

A ready-to-use roadmap

Prioritizing recommendations using the RICE methodology ensures quick identification of quick wins and, conversely, tasks requiring more time and budget investment. This gives you a ready-to-use webperf roadmap.
Your web app quickly improves its Core Web Vitals: LCP, CLS, and INP metrics go from red to green in the Chrome User Experience Report.

From audit to final deployment

SPAs are technically more complex than a CMS, requiring close monitoring of implementations. Once the operational recommendations are transmitted to your teams and deployed, we check them.
A tracking dashboard allows you to manage production or pre-production rollouts based on your bandwidth. This ensures that the deployed changes align with expectations and avoids any risk of regression.

Premium Support

With over 308 clients supported since 2022, Agence Web Performance has established itself as a key player in front-end performance auditing. Entrust us with this mission to unlock the SEO and business potential of your site.

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We audit all JavaScript frameworks

Improve the performance of your critical visits

SPAs offer undeniable performance advantages when it comes to viewing many pages. However, the situation is very different when focusing on the initial load, which occurs for new visitors. Several costly steps must be executed sequentially:

downloading generally heavy JavaScript bundles
executing these scripts, which generate Blocking Time (TBT) and negatively impact interactivity (INP)
rendering the page and its components, which again consumes a significant amount of CPU resources
hydration (adding user interactions), which can occur during or after the third phase depending on the technical stack

Only once these steps have been completed does the original blank page give way to your web application. However, numerous studies have demonstrated the value of focusing specifically on the First Visit Experience: in web performance as in other fields, it is indeed "the first impression that counts".

Our experts are masters in optimizing the loading of SPAs regardless of the framework used: React, Next.js, Angular, Vue.js, Nuxt…

A smartphone user frustrated by her experience

A service in 6 key steps

Our SPA audits are broken down into several key stages.

A videoconference call as part of a service

Technical Alignment

Our experts meet with your teams to learn more about your web application and its technical stack, both back-end and front-end. A focus is placed on the framework, the rendering mode (SSR or CSR), the server environment, and any potential API connections. The objective is to propose operational recommendations adapted to your constraints.

RUM Tag 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.

Site Audit

Our experts examine your site using a well-established methodology and a battery of tools. They identify the issues that impact web performance and, for each one, propose one or more concrete and actionable solutions. In the specific case of SPAs, the JavaScript component undergoes further in-depth analysis. The objective is multifaceted:

reduction of CPU resource usage when idle
improvement of rendering times by reducing unnecessary style and layout recalculations
improvement of responsiveness during navigation (INP metric)

Prioritization of Recommendations

We rank our recommendations using the RICE prioritization method: Reach (number of users reached), Impact on performance, Confidence, and Effort of deployment. We thus design your web performance roadmap by prioritizing the rapid deployment of quick wins for measurable results.

Deliverable Presentation

The deliverable, drafted as part of the performance audit, is presented to the development and business teams. The objective is to ensure that its content is perfectly understood by stakeholders, which is key to a quick and effective implementation. It is also a prime opportunity to answer questions and define the milestones for the final stage.

Testing of deployments

A dashboard allows our experts to monitor the deployments of your development teams. They can thus validate the relevance and effectiveness of the implementations with great responsiveness. This can be done directly in production, or on a staging or pre-production environment (ideal). In case of divergence from what is expected, detailed explanations are shared to help achieve the objective.

They entrusted us with the audit of their web application

Have a question?
We have the answer!

Consult the FAQ for details about the service.

What server-side rendering technologies do you work with?

Our experts work with all types of technical stacks with consistently beneficial results: whether rendering is done client-side (CSR), server-side (SSR), or via static generation (SSG/ISR), we master all modern frameworks.

We adapt our optimizations to the existing architecture for measurable gains, regardless of your stack.

How much does web application optimization cost?

Notre prestation d’audit de SPA est forfaitaire. Elle inclut les trois étapes clés présentées ci-dessus, mais également tout l’accompagnement par nos équipes et avant-vente et en après-vente.

Nos tarifs n’étant pas publics, nous vous invitons à nous contacter par message ou téléphone. Marylise vous communiquera alors notre grille tarifaire ainsi qu’un devis personnalisé.