June 7, 2025 — I am often hired to teach performance to WordPress developers, and every time I see the same problem: good, experienced developers feel unconfident when they face performance issues. They try to do various things but get no or insignificant improvement. This creates frustration and the stereotype that performance is a black box that only a few “chosen ones” can open. This is absolutely not true. What they really lack is a system to follow when identifying performance issues, to be able to solve the exact problems that cause these issues and get significant improvement with the effort they invest. I am going to present the algorithm that I use every single time I improve Core Web Vitals and explain step by step how to identify the issues that really need to be solved so that other developers can apply it in their daily work.

Presentation Slides »

May 20, 2024 — The problem with website performance is that it depends on loads of factors.

It can be that your server resources are not enough for the website’s needs. Or enough, but not configured properly.

It can be media on your website loading at the wrong time, or in the wrong size, or in the wrong format. It can be an icon font loading 300KB of data while it’s only 1 single 1KB icon that is actually being used. It can be an inefficiently built slider, or popup, or media player, or menu module that is loading its assets not at the right time, or loading too many of them. It can be a slow response from the 3rd party that your website depends on to load its data properly.

It can be literally anything. Or a compound effect of a few.

But at the very core, there is just one single reason why your Core Web Vitals are not passing.

I see it all the time with my clients, with both those who are developers and those who are not. Despite the fact that they invest a lot of time and money in website performance, often the results don’t seem to be worth the effort. Most of the disappointment comes from the fact that people are solving problems that have an insignificant to zero impact on website performance. Getting small results creates this frustration around website performance and the stereotype of it being a black box that only a few “chosen ones” can open.

This is absolutely not true. In this talk, I will show how to identify the right problem to fix and target your efforts efficiently to pass Core Web Vitals.

And who knows, maybe afterwards, you would agree that performance optimization is a fun and extremely rewarding game to play.

June 30, 2022

November 17, 2019 — What comes to your mind when you think about technical requirements for successful SaaS company? Should it be lean and easy-to-build, but ready for continuous improvement? Should it have wide opportunities for customization but still be reliable and stay under the control? Should it be powerful and scalable, but still really easy to manage? We’ll see how to build such kind of Software-as-a-Service application using WordPress Multisite, from scratch.

Presentation Slides »

November 13, 2019 — Why should you forget about the scores if you want to speed up your website? Why would using CDN might not help you improve your site speed? How do you get to know your hosting is fast enough? Why does Twitter with all its funny GIFs load lightning-fast and your visitors have to wait for ages while one single kitten gets loaded? How do you make video and images on your website load really fast?

Join Sabrina Zeidan for answers to all of these questions. You will want to take notes!

June 12, 2019 — How has Bootstrapped SaaS WordPress startup managed to take in $2.6 million in 5 years?
Sabrina Zeidan interviews WP Media CEO Jean-Baptiste Marchand-Arvier at WordCamp Paris 2019.

The facts about WP Rocket, the most successful WordPress performance plugin:
• 750K+ websites are boosted by WP Rocket
• Team of 20
• $2.6 million in 5 years
• Bootstrapped

#MadeInWordPress

June 5, 2019 — Why you should forget about the scores if you want to speed up your website? What is TTFB and why you should care about it? Why using CDN might not help you improve the site speed? Why Twitter with all that funny GIFs loads lightning fast and your visitors have to wait for ages while one single kitten gets loaded? How do you get to know your hosting is fast enough?

During this session we will learn:

– how to measure website load times and interpret the results
– what should you do after all possible caching is already on but your website is still awfully slow
– how to define bottlenecks and fix them without making significant changes to the theme.

Let’s make websites load faster together!

March 27, 2019 — What comes to your mind when you think about technical requirements for successful SaaS company? Should it be lean and easy-to-build, but ready for continuous improvement? Should it have wide opportunities for customization but still be reliable and stay under the control? Should it be powerful and scalable, but still really easy to manage? We’ll see how to build such kind of Software-as-a-Service application using WordPress Multisite, from scratch.

March 15, 2019 — Interview with developer Sabrina Zeidan on her first talk at a WordCamp, presenting for the first time in English, and how she discovered WordPress and multisites.The video is part of a series of interviews with the Make WordPress Marketing team at WordCamps and MeetUps to highlight the community and encourage contributors.

November 7, 2018 — Let’s see whether you can make your next complex WordPress project easier with WordPress Multisite. Imagine hundreds of websites in the single instance of WordPress. Each is independent but connected together. What it will be? Governmental website or multilingual online store? Blogging platform or franchising company? Country basketball teams websites or online education centre? These all made easy with WordPress Multisite. Network of WordPress sites will grow with you! You’ll see what WordPress Multisite capable of and when to ask a developer to use it.