Julian Jandl

JavaScript Conference 2024 (Warsaw & Online)
Learn from the Best
Meet Julian Jandl

Julian Jandl

Cut My Task Into Pieces - This is Concurrent Mode

JavaScript is single threaded. Every script our application executes runs on the main thread. Keeping the execution time as short as possible is crucial for the runtime performance and responsiveness of our applications. Too long running scripts will result in bad (Core) Web Vitals like INP and TBT.

In this talk, we’ll uncover another solution to this problem, the Concurrent Mode. Having profound knowledge about how to orchestrate work on the main thread is key to understanding how the Concurrent Mode works. We’ll start with a deep dive into the JavaScript Event Loop and explore the characteristics of different scheduling techniques.

Building up on the scheduling techniques, I will explain how to implement a custom scheduler.

Finally, we’ll wrap things up with a live demonstration on how to apply the Concurrent Mode to angular applications. We’ll progressively improve the (Core) Web Vitals INP and TBT on this journey.

Julian Jandl - Lead Performance Engineer, Trainer & Consultant, push-based.io | Austria

Julian is Lead Performance Engineer, Trainer & Consultant at Push-Based.io. As a webperf enthusiast, he loves experimenting with cutting edge technologies to improve the speed of the web at scale. Julian is conducting performance audits for existing applications, fixing performance bottlenecks and teaching about webperf & angular in workshops.

As an RxAngular core maintainer he is contributing his knowledge to the community.

Workshops

Architecting Angular Apps for High Performance: Control the Browser Render Pipeline, Master the Event Loop, Measure & Optimize CWV by Michael Hladky & Julian Jandl - Master Class (stationary & online)

What You Will Learn

✔️ Control the Browser Render Pipeline - To make your app faster, you need to understand how the browser interprets your code. Learn the different stages of the Browser Render Pipeline. Get to know the tools to inspect & analyze bottlenecks in your application. Write code that always performs optimally.

✔️ Master the Javascript Event Loop - If you care about performance in any JavaScript application, mastering the Event Loop is a must. Dive deep into the JavaScript vm and learn techniques to avoid slow performing code on real world applications.

✔️ Measure & Optimize (Core) Web Vitals - Your performance has a score. Learn how it’s composed, measured and techniques to improve it. Get an expert in analyzing and improving LCP, CLS, INP, TBT, TTFB & more.

✔️ Go Zoneless: Master the new zoneless & signal-based change detection - Understand how Angular is getting faster because of the new change detection and zoneless features. Learn how to benefit from them.

✔️ Use CSS and DOM performance best practices - Improve the performance of real world applications by applying the latest CSS features. Learn how to identify and fix forced reflows and how to avoid layout thrashing.

✔️ Optimize your apps Network requests - Enterprise apps consume a lot of data. Master the tools that allow you to identify network related performance bottlenecks. Learn techniques and strategic approaches to optimize network related data consumption to ultimately improve the performance of your application.

Takeaway
From this workshop you will walk away with a deep understanding of how to enhance your applications performance. You'll gain practical knowledge of the JavaScript event loop, learn optimization techniques for the Core Web Vitals, and understand how to effectively utilize strategic approaches to identify & encounter performance bottlenecks. We'll dive deep into the browsers render pipeline, ensuring you know how to measure and improve your apps performance properly. Additionally, you will learn to apply advanced features like measuring CSS execution performance & utilizing cutting-edge CSS and DOM APIs to reduce reflows and prevent layout thrashing.

Learn from the Best Featured Speakers

Tomasz Ducin

Independent Consultant, Architect, Developer & Trainer, Poland

Dr. Philippe De Ryck

Security Expert, Founder, GDE, Pragmatic Web Security | Belgium

Sylwia Laskowska

Senior JavaScript Developer, Atos | Poland

Eugene Fidelin

Engineering Manager & Frontend SME, eBay | Netherlands

Julien Huang

Nuxt Core Team, Leetchi | France

Jemima Abu

Front End Developer, GDE, Microsoft MVP , CAIS | UK

Nir Kaufman

Tech Lead, Full-stack AI Engineer, GDE, Tikal | Israel

Daria Poliakova

Front-end developer, Conscensia | Poland

Matthew Podwysocki

Staff Engineer, Mapbox | USA

Damian Płaza

Senior Software Engineer / Power Grid Gdańsk R&D Manager, Volue/Bottega IT Minds | Poland

Soumaya Erradi

Senior Software Developer, Atlantis S.R.L. | Italy

Ihor Maistrenko

Angular / .NET Developer / Team Lead, Conscensia | Poland

Manfred Steyer

GDE for Angular, softwarearchitekt.at | Austria

Jakub Andrzejewski

Senior Fullstack Developer & Advocate, GDE, Monterail | Poland

Markus Ingvarsson

Back End Developer, Podme | Sweden

Michał Jawulski

Managing Delivery Architect, Capgemini | Poland

Frizzarin Nicolas

Senior Staff Engineer, GDE, SFEIR | Luxembourg

Önder Ceylan

Principal Engineer, Google Developers Expert, Jumbo Supermarkten | Netherlands

Alain Chautard

GDE, Expert Web Consultant, Trainer, Mentor, Angular Training | France

Michael Egger-Zikes

Trainer & Consultant, AngularArchitects.io | Austria

Alex Okrushko

Senior Software Engineer, Snowflake | Canada

Alexander Thalhammer

Passionate Angular Developer, Angular Architects | Austria

Younes Jaaidi

Software Development Cook, Teacher & Coach, GDE | France

Daniel Sogl

Software-Architekt, Thinktecture AG | Germany

Rainer Hahnekamp

Trainer and Consultant, AngularArchitects.io | Austria

Dariusz Kalbarczyk

Google Developer Expert, Author, Podcaster, NG/JS/AI POLAND | Poland

Companies that support the JavaScript ecosystem
Our Sponsors 2025

By becoming a sponsor of JS Poland, you gain a unique opportunity to showcase your company and products to hundreds of experienced JavaScript developers, engineers, and tech leaders from across Europe. This kind of exposure can boost visibility, strengthen your brand within the JS community, and help you attract top engineering talent. To learn more about our sponsorship opportunities, please fill in the form.

Join our mailing list

Sign up to receive updates about JS Poland, including workshops, speaker previews, ticket launches, JS Awards, JavaScript Master Podcast, Behind the Code Magazine, CFP details and other exclusive content. We won’t spam you and will only send you emails we genuinely think you’ll find interesting. You can unsubscribe at any time and you can find more information here.