Link tags: speed



Will Serving Real HTML Content Make A Website Faster? Let’s Experiment! - WebPageTest Blog

Spoiler: the answer to the question in the title is a resounding “hell yeah!”

Scott brings receipts.

How To Improve Largest Contentful Paint for Faster Load Times - Calibre

A no-nonsense checklist of good performance advice from Karolina.

The impact of removing jQuery on our web performance - Inside GOV.UK

Following on from that excellent blog post about removing jQuery from, here are the performance improvements in charts and numbers.

It may sound like 32 kb of JavaScript is nothing on today’s modern web with quick devices and fast broadband connections. But for a certain cohort of users, it makes a big difference to how they experience GOV.UK.

SPAs: theory versus practice | Read the Tea Leaves

At the risk of grossly oversimplifying things, I propose that the core of the debate can be summed up by these truisms:

  1. The best SPA is better than the best MPA.
  2. The average SPA is worse than the average MPA.

Still the Same — Real Life

Everything old is new again:

In our current “information age,” or so the story goes, we suffer in new and unique ways.

But the idea that modern life, and particularly modern technology, harms as well as helps, is deeply embedded in Western culture: In fact, the Victorians diagnosed very similar problems in their own society.

Introducing Opportunities & Experiments: Taking the Guesswork out of Performance - WebPageTest Blog

WebPageTest just got even better! Now you can mimic the results of what would’ve previously required actually shipping, like adding third-party scripts, switching from a client-rendered to a server-rendered architecture and other changes that could potentially have a big effect on performance. Now you can run an experiment to get the results before actual implementation.

How to make MPAs that are as fast as SPAs | Go Make Things

The headline is a little misleading because if you follow this advice, your multi-page apps will be much much faster than single page apps, especially when you include that initial page load of a single page app.

Here’s a quick high-level summary of what I do…

  1. Serve pre-rendered, mostly static HTML.
  2. Inline everything, including CSS and JavaScript.
  3. Use mostly platform-native JavaScript, and as little of it as possible.
  4. Minify and gzip all the things.
  5. Lean heavily on service workers.

That’s an excellent recipe for success right there!

Why you should prioritise quality over speed in design systems by Amy Hupe, content designer.

Speed for the sake of speed means nothing. If our design systems don’t ultimately lead to better quality experiences, we’re doing it wrong.

When we rush to release one-size-fits-all components, without doing the work to understand different contexts before curating and consolidating solutions, we sacrifice quality at the hands of speed.

The irony? In the long run, this will slow us down. We end up having to undo the work we’ve done to fix the problems we’ve created.

Ultimately, when we prioritise speed over quality, we end up with neither.

Making Reasonable Use of Computer Resources

The paradox of performance:

This era of incredibly fast hardware is also the era of programs that take tens of seconds to start from an SSD or NVMe disk; of bloated web applications that take many seconds to show a simple list, even on a broadband connection; of programs that process data at a thousandth of the speed we should expect. Software is laggy and sluggish — and the situation shows little signs of improvement. Why is that?

Because we prioritise the developer experience over the user experience, that’s why:

Although our job is ostensibly to create programs that let users do stuff with their computers, we place a greater emphasis on the development process and dev-oriented concerns than on the final user product.

We would do well to heed Craig’s observations on Fast Software, the Best Software.

Introducing Astro: Ship Less JavaScript

In Astro, you compose your website using UI components from your favorite JavaScript web framework (React, Svelte, Vue, etc). Astro renders your entire site to static HTML during the build. The result is a fully static website with all JavaScript removed from the final page.


When a component needs some JavaScript, Astro only loads that one component (and any dependencies). The rest of your site continues to exist as static, lightweight HTML.

That’s the way to do it! Make the default what’s best for users (unlike most JavaScript frameworks that prioritise developer convenience at the expense of the end user experience).

This is a tagline I can get behind:

Ship Less JavaScript

Real-world CSS vs. CSS-in-JS performance comparison - Tomas Pustelnik’s personal website

CSS-in-JS can have a noticeable impact on your webpage. Mainly for low-end devices and regions with a slower internet connection or more expensive data. So maybe we should think better about what and how we use our tooling. Great developer experience shouldn’t come at the expense of the user experience.

Performance-testing the Google I/O site -

Modern web development:

Imagine you went to a restaurant, took a seat, and 20 minutes later you still haven’t been given a menu. You ask where it is, and you’re told “oh, we’re currently cooking you everything you might possibly ask for. Then we’ll give you the menu, you’ll pick something, and we’ll be able to give you it instantly, because it’ll all be ready”.

Single page apps, ladies and gentlemen.

Global performance insights for your site | Lighthouse Metrics

I hadn’t come across this before—run Lighthouse tests on your pages from six different locations around the world at once.

Cookie Consent Speed.Run

My current score is one minute and 18 seconds. Can you beat it?

Now THAT’S What I Call Service Worker! – A List Apart

This is terrific! Jeremy shows how you can implement a fairly straightforward service worker for performance gains, but then really kicks it up a notch with a recipe for turning a regular website into a speedy single page app without framework bloat.

The Performance Inequality Gap, 2021 - Infrequently Noted

Developers, particularly in Silicon Valley firms, are definitionally wealthy and enfranchised by world-historical standards. Like upper classes of yore, comfort (“DX”) comes with courtiers happy to declare how important comfort must surely be. It’s bunk, or at least most of it is.

As frontenders, our task is to make services that work well for all, not just the wealthy. If improvements in our tools or our comfort actually deliver improvements in that direction, so much the better. But we must never forget that measurable improvement for users is the yardstick.

System fonts don’t have to be ugly /// Iain Bean

You don’t have to use web fonts—there are some pretty nice options if you stick to system fonts (like Georgia, Charter, and Palatino).

How to avoid layout shifts caused by web fonts – Simon Hearne

A terrific in-depth look at improving the performance of web fonts.