Felix Gerschau

Welcome!

I'm Felix and I'm a web developer.

I use this blog for writing about the things I learn and what I'm interested in.

Lately, this includes React, PWAs, and frontend performance.

Service Workers Explained - Introduction to the JavaScript API

30/06/20 | 7 min

Introduction to Service Workers, explaining the most important concepts and features.

Top 10 Web Developer Blogs in 2020

19/06/20 | 3 min

Top blogs by real humans about web development to read in 2020

High Performance Mobile Web by Maximiliano Firtman - Review and notes

12/06/20 | 9 min

My review and thoughts on the book plus the personal notes I took while reading it.

Service Worker Lifecycle Explained

29/05/20 | 7 min

Explaining the lifecycle of Service Workers in PWAs and how to update them as fast as possible.

How to Make your React App a Progressive Web App (PWA)

18/05/20 | 14 min

Explaining the most important concepts around PWAs followed by a step by step tutorial, using Webpack, Workbox and TypeScript.

When does React re-render components?

26/04/20 | 8 min

React re-rendering explained and how to optimize React's re-render performance

How to use React.memo() to improve performance

19/04/20 | 3 min

Learn how to use React.memo, some common pitfalls you might encounter, and why you shouldn't use React.memo for all your components.

Getting into Performance Budgets

10/04/20 | 7 min

In this article, I'll give you an introduction to performance budgets, the metrics and tools you can use and how you can implement them in your company.

Premature Optimization in JavaScript

04/04/20 | 3 min

In this article I'll explain what premature optimization and premature pessimization are and what kind of optimizations JavaScript developers should use.

Custom Metrics with WebPageTest and TravisCI

29/03/20 | 7 min

Learn how to set up custom metrics using WebPageTest API and TravisCI