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.
Tuesday, June 7th, 2022
Wednesday, April 20th, 2022
This is a really excellent four-part series on web performance that really dives into the technical details and asks all the right questions:
Thursday, February 24th, 2022
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…
That’s an excellent recipe for success right there!
Monday, November 8th, 2021
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.
Saturday, August 7th, 2021
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.
Wednesday, June 9th, 2021
This is a tagline I can get behind:
Tuesday, June 8th, 2021
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.
Sunday, May 2nd, 2021
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.
Tuesday, April 20th, 2021
I hadn’t come across this before—run Lighthouse tests on your pages from six different locations around the world at once.
Friday, March 19th, 2021
My current score is one minute and 18 seconds. Can you beat it?
Thursday, March 18th, 2021
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.
Friday, March 12th, 2021
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.
Monday, March 8th, 2021
This could give a big boost to web performance!
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).
Friday, January 29th, 2021
A terrific in-depth look at improving the performance of web fonts.
Wednesday, December 23rd, 2020
This is great! The folks at Basecamp are releasing the front-end frameworks they use to build Hey. There’s Turbo—the successor to Turbolinks:
It offers a simpler alternative to the prevailing client-side frameworks which put all the logic in the front-end and confine the server side of your app to being little more than a JSON API.
With Turbo, you let the server deliver HTML directly, which means all the logic for checking permissions, interacting directly with your domain model, and everything else that goes into programming an application can happen more or less exclusively within your favorite programming language. You’re no longer mirroring logic on both sides of a JSON divide. All the logic lives on the server, and the browser deals just with the final HTML.
Yes, this is basically Hijax (which is itself simply a name for progressive enhancement applied to Ajax) and I’m totally fine with that. I don’t care what it’s called when the end result is faster, more resilient websites.
Compare and contrast the simplicity of the Hotwire/Turbo approach to the knots that React is tying itself up in to try to get the same performance benefits.
Thursday, November 12th, 2020
Good news: as of May 2021, page speed (or core web vitals, if you must) will be a ranking factor in Google Search.
Even better news: at the same time, Google AMP will lose its unfairly privileged position in the top stories carousel. Hopefully this marks the beginning of the end for Google’s failed experiment in forcing publishers to use their tech.
Thursday, September 24th, 2020
Performance and people
I was helping a client with a bit of a performance audit this week. I really, really enjoy this work. It’s such a nice opportunity to get my hands in the soil of a website, so to speak, and suggest changes that will have a measurable effect on the user’s experience.
Not only is web performance a user experience issue, it may well be the user experience issue. Page speed has a proven demonstrable direct effect on user experience (and revenue and customer satisfaction and whatever other metrics you’re using).
It struck me that there’s a continuum of performance challenges. On one end of the continuum, you’ve got technical issues. These can be solved with technical solutions. On the other end of the continuum, you’ve got human issues. These can be solved with discussions, agreement, empathy, and conversations (often dreaded or awkward).
I think that, as developers, we tend to gravitate towards the technical issues. That’s our safe space. But I suspect that bigger gains can be reaped by tackling the uncomfortable human issues.
This week, for example, I uncovered three performance issues. One was definitely technical. One was definitely human. One was halfway between.
The technical issue was with web fonts. It’s a lot of fun to dive into this aspect of web performance because quite often there’s some low-hanging fruit: a relatively simple technical fix that will boost the performance (or perceived performance) of a website. That might be through resource hints (using
link rel=“preload” in the HTML) or adjusting the font loading (using
font-display in the CSS) or even nerdier stuff like subsetting.
In this case, the issue was with the file format of the font itself. By switching to woff2, there were significant file size savings. And the great thing is that
@font-face rules allow you to specify multiple file formats so you can still support older browsers that can’t handle woff2. A win all ‘round!
The performance issue that was right in the middle of the technical/human continuum was with images. At first glance it looked like a similar issue to the fonts. Some images were being served in the wrong formats. When I say “wrong”, I guess I mean inappropriate. A photographic image, for example, is probably going to best served as a JPG rather than a PNG.
But unlike the fonts, the images weren’t in the direct control of the developers. These images were coming from a Content Management System. And while there’s a certain amount of processing you can do on the server, a human still makes the decision about what file format they’re uploading.
I’ve seen this happen at Clearleft. We launched an event site with lean performant code, but then someone uploaded an image that’s megabytes in size. The solution in that case wasn’t technical. We realised there was a knowledge gap around image file formats—which, let’s face it, is kind of a techy topic that most normal people shouldn’t be expected to know.
But it was extremely gratifying to see that people were genuinely interested in knowing a bit more about choosing the right format for the right image. I was able to provide a few rules of thumb and point to free software for converting images. It empowered those people to feel more confident using the Content Management System.
It was a similar situation with the client site I was looking at this week. Nobody is uploading oversized images in order to deliberately make the site slower. They probably don’t realise the difference that image formats can make. By having a discussion and giving them some pointers, they’ll have more knowledge and the site will be faster. Another win all ‘round!
At the other end of continuum was an issue that wasn’t technical. From a technical point of view, there was just one teeny weeny little script. But that little script is Google Tag Manager which then calls many, many other scripts that are not so teeny weeny. Third party scripts …the bane of web performance!
Now one technical solution would be to remove the Google Tag Manager script. But that’s probably not very practical—you’ll probably just piss off some other department. That said, if you can’t find out which department was responsible for adding the Google Tag Manager script in the first place, it might we well be an option to remove it and then wait and see who complains. If no one notices it’s gone, job done!
More realistically, there’s someone who’s added that Google Tag Manager script for their own valid reasons. You’ll need to talk to them and understand their needs.
Again, as with images uploaded in a Content Management System, they may not be aware of the performance problems caused by third-party scripts. You could try throwing numbers at them, but I think you get better results by telling the story of performance.
Use tools like Request Map Generator to help them visualise the impact that third-party scripts are having. Talk to them. More importantly, listen to them. Find out why those scripts are being requested. What are the outcomes they’re working towards? Can you offer an alternative way of providing the data they need?
I think many of us developers are intimidated or apprehensive about approaching people to have those conversations. But it’s necessary. And in its own way, it can be as rewarding as tinkering with code. If the end result is a faster website, then the work is definitely worth doing—whether it’s technical work or people work.
Personally, I just really enjoy working on anything that will end up improving a website’s performance, and by extension, the user experience. If you fancy working with me on your site, you should get in touch with Clearleft.
Monday, September 7th, 2020
The problem is that most websites will adapt to the ever faster connections, which makes them gradually inaccessible for people with slower connections. Today, most websites are impossible to download with a dial-up connection, because they have become too corpulent.
This speaks to me:
Everything we do to make it harder to create a website or edit a web page, and harder to learn to code by viewing source, promotes that consumerist vision of the web.
Pretending that one needs a team of professionals to put simple articles online will become a self-fulfilling prophecy. Overcomplicating the web means lifting up the ladder that used to make it possible for people to teach themselves and surprise everyone with unexpected new ideas.
There’s a list of links at the end of this piece to help you reach this goal:
It is vital that the web stay participatory. That means not just making sites small enough so the whole world can visit them, but small enough so that people can learn to build their own, by example. Bloat makes the web inaccessible.
Wednesday, August 19th, 2020