How To Boost JavaScript Runtime Performance

How To Boost JavaScript Runtime Performance

There’s lots of advice, but it seems to taper off when it comes to advanced performance tactics. I’ve read the articles, but it’s either too vague, too broad, or just basic stuff I have already done.

There’s lots of advice, but it seems to taper off when it comes to advanced performance tactics. I’ve read the articles, but it’s either too vague, too broad, or just basic stuff I have already done. Where are the more advanced articles on performance, most importantly — why are we not combining tech and talking about a stacked implementation?

This has been my real-world experience, tools, or tactics I've used. I like web performance and am a little obsessed. These ideas can be a little quirky or abstract, there are probably better ways to handle perf.

With that said…

The Basics

Let's get these out the way, mostly common sense and typical perf suggestions.

  • Use Brotli
  • Use http2
  • Use webp and a CDN that can dynamically resize and serve the most efficient formats
  • Code split your app
  • Utilize edge networks
  • Don’t preload videos, don’t autoplay videos until intersection observer is activated.
  • Use CSS and JS optimization
  • Tweak webpack chunking to reduce cache misses when redeploying
  • Trim the tag manager, move really static code into your own

Lazy-load images with intersection observer

Responsive images, lazy-loading, and intersection observer.

This component can speed up load times. Especially if a page consists of multiple images, even small ones. Image requests can block up the network priority. I try not to lazy load the first image in a carousel depending on where it is in the fold. You want to leave some margin when using intersection observer so there's enough scrolling time left for resources to be loaded just before view

software-architecture web-performance web-development javascript webpack-5

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