Web Performance & Core Web Vitals Workshop
Improve your teams Core Web Vitals knowledge, get practical insight and be ready to meet the demands of a modern fast website.
Performance is Predictable!
High performance is a calculated result. A browser is just a machine processing code into pixels based on strict rules. You understand those rules and passing Core Web Vitals becomes easy. The complexity vanishes and performance becomes a manageable, predictable asset.
In my masterclass you learn the metrics and how they work. We start with the browser. You master the rendering engine mechanics. But we go further. You connect those technical mechanics directly to Real User Monitoring and revenue.
This training bridges the gap between code and commercial success. You get the full picture, from the server to the screen.
Who is this for?
This training is designed for technical professionals who want to master web performance.
Frontend Developers
You build the UI and want to ensure it's fast, responsive, and passes Core Web Vitals.
Tech Leads
You are responsible for the technical direction and want to set performance standards for your team.
QA Engineers
You want to incorporate performance testing into your QA process and catch regressions early.
Client Success
Don't just take my word for it
Engineering Lead, Loop
"It's amazing how simple Arjen can make LCP optimization sound. We applied his framework and saw our metrics improve by 40% within a single week."
Lead Engineer, DPG Media
"Arjen simplifies the most complicated performance issues and he is really passionate about it. It makes learning the hard stuff actually enjoyable."
Senior Frontend Dev, Jamie Oliver Group
"After this training we finally understand exactly why our INP scores were failing and knew precisely which interaction costs to cut."
The Curriculum
What we cover.
From internals to strategy.
Browser Internals
Understand the machine to master the metrics. How the browser parses HTML, builds the DOM and paints pixels.
Advanced Web Vitals
Go beyond definitions. Analyze specific browser APIs and debug when field data contradicts lab data.
Performance Profiler
Master the most powerful tool. Analyze flame charts, identify long tasks and trace interaction delays.
Architectural Strategy
Maintain performance at scale. Third party management, hydration strategies and performance budgets.
The Format
Mastery in 3 Parts.
Designed for deep retention.
Session Flow
Theory & Concepts
Deep dive into browser internals. Understanding the machine.
Live Case Study
Real-time optimization. Watching the theory applied live.
Your Real Cases
Solving your specific challenges. Interactive problem solving.
About the Trainer - Arjen Karel
I am a Freelance Web Performance Consultant. I teach from experience in high stakes production environments.
I optimized platforms for major brands like eBay, Adevinta and KPN. My work operates at the intersection of technical engineering and business revenue.
Train with me. You get access to the strategies I use to fix impossible performance issues for enterprise clients. I cut through the noise and show you exactly what works.
Secure Your Spot
Join the next cohort and master Core Web Vitals. Spaces are limited to ensure personalized attention.
What you need
- Laptop with Chrome installed
- Stable internet connection
- Basic understanding of HTML/CSS
Payment: Invoice will be sent after registration. You can pay via Bank Transfer or Credit Card.
Trusted by market leaders
Your frequently asked questions answered
You need clarity before you commit. Here are the straight answers regarding the technical depth, requirements and logistics of the masterclass. If your question is not listed here contact me directly.
Technical Scope & Prerequisites
Is this course for beginners?
No. This is an advanced masterclass. You need a basic understanding of JavaScript and web development to keep up. We skip the basics and go straight into the mechanics of the browser. If you want to master performance engineering you are in the right place.
Do you focus on specific frameworks like React or Next.js?
I focus on the browser. The browser is the machine that runs your code. It does not care which framework you use. The rules of the Critical Rendering Path and the Core Web Vitals apply to everyone. You learn to optimize any site regardless of the tech stack.
What tools do I need?
You need Chrome. We spend a lot of time in the Chrome DevTools and the Performance Profiler. I show you how to set up your environment for deep analysis.
Do you cover Interaction to Next Paint (INP)?
Yes. INP is the definitive responsiveness metric. We spend dedicated time dissecting the main thread and the event loop. You learn to identify long tasks and break up heavy JavaScript execution to keep the interface responsive to user input.
Do you teach Third Party Script management?
Yes. You cannot simply delete your marketing tags. I teach you how to govern them. We cover loading strategies and execution timing so you can maintain your ad revenue and analytics without destroying your performance scores.
Course Format & Real World Application
What is the schedule and time commitment?
We run 3 sessions of 3 hours each (9 hours total). This structure allows you to digest the complex technical material between sessions. We typically schedule these over 1 or 2 weeks to fit your sprint cycle.
Will we audit my specific website?
Yes. This is a hybrid between training and consultancy. Each 3-hour session is split: 2 hours of deep technical learning and 1 hour of live debugging on your specific application. We take your current "impossible" tickets and solve them live on the call using the techniques we just covered.
Do you cover Real User Monitoring (RUM)?
Yes. Lab data is useful but Field Data (CrUX) determines your search ranking. You learn to interpret RUM data and correlate it with your technical changes. We focus on moving the metrics that actually count for Google.
Does speed actually impact revenue?
Yes. Data proves it consistently. When you improve Core Web Vitals you improve the user experience. Happy users buy more and stay longer. You can measure the return on investment from this training in your own analytics.
Do we focus on Mobile or Desktop?
We prioritize mobile. Mobile devices have slower CPUs and unreliable networks. It is the harshest environment for your code. When you optimize for mobile you automatically guarantee excellent performance on desktop.
Logistics & Team Booking
Can I book this for my entire engineering team?
Yes. Training the whole team is efficient. It gets everyone on the same page and creates a performance culture. Contact me directly for team rates and scheduling.
Do you provide a recording of the session?
Yes. You get access to the recording and the slide deck. You can review the complex profiling techniques and browser mechanics at your own pace after the masterclass.
