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There are two schools of thought to measure web performance: Synthetic Monitoring and Real User Monitoring (RUM). Even though they are often opposed, the two methods are complementary. This article reviews the two types of monitoring. What is it all about? What are they used for? How to use them effectively? What are the pitfalls to avoid?

Continue reading Measuring web performance: Synthetic vs Real User Monitoring

As guarantors of web performance, any IT and Marketing team should set up a Performance Budget.

This concept first appeared in 2013. When we refer to a Performance Budget, we are not talking about a budget in the financial sense of the word. A Performance Budget means setting a performance threshold that you hope to stay within. Hence, it is not expressed in pounds or dollars but in terms of a metric such as seconds, page weight or number of files. Have you never established one yet? Now may be the time to get started, we’ll explain why and how.

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An increasing number of third party services are now being incorporated into today's web sites. In 2012, a typical web page contained an average of 13 third party scripts or "tags". Today, our Top 40 analysis of French e-commerce web sites shows that this number has risen to an average of 21 third party tags, an increase of 62%.

These third party services provide added value, with the promise of increased revenue (e.g. via advertising), higher conversion rates (through the use of retargeting tags) or a better understanding of user profiles (through embedded analytics).

But they also have a poor reputation when it comes to their impact on performance! A number of studies have attempted to prove this in the past (including studies such as those conducted by Instart Logic and NCC Group), and it forms a key part of the rationale behind ad blockers (a topic we will come back to in a future article).

We were keen to find out just how much of an impact these various third party widgets would have on the monthly web performance rankings published on JDN.

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Today, we are opensourcing one of our project Geonosis which synchronize Zookeeper trees with local files. Here is why we have created Geonosis.
Continue reading Announcing Geonosis

As you may know, Fasterize is an active partner of webpagetest and host the agents for Paris. Today, we explain in detail the official guide on https://sites.google.com/a/webpagetest.org/docs/private-instances.
The purpose of this guide is giving the maximum pieces of information to install an agent. Most steps are illustrated with pictures.

Continue reading [Installation guide] Webpagetest agent on windows server 2008

When you work in the web performance world, you’re constantly reading blog posts about new techniques or new hacks that are implemented or tried on new website / Single Page app / mobile website / CMS. You also meet a lot of people telling you that “yes we do some concatenation, minification, whatever … but mhhh … not for this because it’s outside the deployment process … “. Or you see people trying to speed up their websites without monitoring anything.

So instead of focusing on techniques, shouldn’t we watch the side aspects of web performance as being as important as techniques?

Continue reading Web performance is not a matter of technique