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I regularly help people with performance of their React apps.

I had several cases this year where someone complained about things being slow in Chrome with network throttling, but a test on a real network didn’t reproduce that.

Back in 2018, when doing a performance audit for a client, I stumbled upon an unusually-looking piece of code: /*!

Causal is a React spreadsheet app for creating complex forecasting models: Sometimes, Causal models get huge, which raises challenges in keeping them fast.

Say you just finished optimizing your React app and making every button click as fast as possible.

This is a shareable version of an X thread.

Web performance isn’t going to save you in this crisis.

A colleague asked me: These days, how do you typically serve polyfills only to browsers that need them?

Web performance is important.

There’re lots of ways to improve web performance (see Web Performance 101 for a full overview).