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.

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

Measuring the Performance of JavaScript Functions

25/03/20 | 8 min

Start measuring your JavaScript function's performance with these APIs and learn how to use them.

How to communicate with Service Workers

22/02/20 | 4 min

This article gives you an overview of the MessageChannel, Broadcast API and Client API and helps you to decide which one to use.

PWA Update Notification with Create React App

27/01/20 | 4 min

Learn how to trigger update notifications that ensure that your users are using the latest version of your Progressive Web App.