🧰 BundlePhobia • See the cost of adding an npm package to your bundle in terms of size and download time
Chrome Dev Tools
Use the Performance tab to record a page load and see what's taking the most time:
Sort by "Self Time" to see which functions are taking the most time to run
Sort by "Network" to see which resources are taking the most time to load (true?)
Safari Dev Tools
📺 Debugging iOS Safari JS issues on a mac • 8 minute video by Wes Bos demonstrating how to use the Mac Safari dev tools to debug an issue occurring in iOS Safari
SEO
📺 SEO for Developers in 100 Seconds • 12 minute video by Fireship explaining SEO fundamentals from a web developer's perspective and showing how to optimally structure and render HTML for bots