How do you measure the impact of Fasterize?

Mesurer l'impact de Fasterize sur les performances et la vitesse des pages

Our SaaS solution automatically improves the your website’s loading speed. Our engine works like a proxy in the Cloud, rewriting your page code on the fly to optimise your website’s loading time on desktop and mobile, for all your users, whatever the browsing context. But in practice, apart from improving the speed perceived by your visitors, how can you measure the impact of optimising loading speed on your conversions? In this article, we look in detail at how to test the effects of Fasterize to evaluate the ROI of our solution.

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Web Performance KPI: definition and deciphering of the Load Time

Load Time


In the history of web performance, “Load Time” was one of the first indicators used to measure the loading times of web pages. Over time, the other KPIs we’ve talked about—Speed Index, Time To Interactive, etc.—made their way onto the scene to assess the perception of speed and Load Time was retired to a dusty old shelf at the back of a storeroom. Let’s look back on this web performance metric that once played an important role, but which is no longer sufficient for assessing the speed of your website, and we’ll see why.

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Custom Metrics: customize your web performance metrics to measure your website speed

Measure - Custom - Web performance

To assess your loading times and improve them, you need to precisely identify your tasks and events that take up the most time for browsers. But how do you know how long it takes a script to execute? Or when the main image on a page displays? What is the processing time for a user action before it executes?

To answer all of these questions, the conventional tools and metrics may only provide limited responses. The answers can be found with custom metrics via the User Timing API.

Jean-Pierre Vincent explains how to use it.

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[Backend & web performance 1/2] How to choose your web hosting solution

Web hosting - Backend

For pages that load quickly, focusing on what appears in the browser by optimizing your frontend seems quite obvious. But do you also pay attention to what’s happening behind the scenes on your servers? 

For optimum performance, your backend requires as much attention as your frontend. 

Here is some advice about the criteria you should be taking into account so that your infrastructure can hold its own.

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Web performance fundamentals: perks of a Content Delivery Network (CDN)


A Content Delivery Network (CDN) helps optimise the distribution of content by bringing it closer to internet users. But that’s not all: it’s also useful for the speed and security of your website. Here’s everything you need to know about what a CDN is, how it works, and what it’s good for. We’ll also explain how Fasterize is a “next generation” CDN, as well as all the benefits you can get from it!

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HTTP cache: a pillar of web performance, for improving loading speed and user experience



Caching is one of the most effective techniques for having fast pages and for improving loading speeds by several hundred milliseconds.

This time scale may seem minuscule, but cumulatively, all of those milliseconds can add up to seconds… and 1 extra second of loading time results in fewer conversions. It’s worth noting that in the retail sector, 1 extra second of loading time can make conversions fall by up to -20%.

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