Tools to use to improve performance

webpagetest: Run a free website speed test from multiple locations around the globe

Page Speed Insights from google

GTmetrix: See how your site performs, reveal why it’s slow, and discover optimization opportunities.


Image file format

Learn about images file format and how they differ

???? Les formats des fichiers graphiques : tout ce que vous avez toujours voulu savoir (sans jamais oser le demander)

???? See How Images Affect Your Page Speed

???? GIF, PNG, JPG, or SVG. Which One To Use?

Image Optimizations

zero to mastery

???? To remove image metadata

Delivery optimization

Max parallel http connections in a browser?

Critical Rendering Path

1️⃣ CRP: MDN web docs

2️⃣ CRP: Understanding the Critical Rendering Path CSS-Tricks

3️⃣ CRP: Understanding the critical rendering path, rendering pages in 1 second

Useful links

Web UI Performance — Behind The Scenes

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