Tags: loading

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Wednesday, September 5th, 2018

The Font Loading Checklist—zachleat.com

This checklist came in very handy during a performance-related workshop I was running today (I may have said the sentence “Always ask yourself What Would Zach Do?”).

  1. Start Important Font Downloads Earlier (Start a Web Font load)
  2. Prioritize Readable Text (Behavior while a Web Font is loading)
  3. Make Fonts Smaller (Reduce Web Font load time)
  4. Reduce Movement during Page Load (Behavior after a Web Font has loaded)

The first two are really straightforward to implement (with rel="preload" and font-display). The second two take more work (with subsetting and the font loading API).

Tuesday, July 31st, 2018

Prioritizing the Long-Tail of Performance - TimKadlec.com

Focusing on the median or average is the equivalent of walking around with a pair of blinders on. We’re limiting our perspective and, in the process, missing out on so much crucial detail. By definition, when we make improving the median or average our goal, we are focusing on optimizing for only about half of our sessions.

Tim does the numbers…

By honing in on the 90th—or 95th or similar—we ensure those weaknesses don’t get ignored. Our goal is to optimize the performance of our site for the majority of our users—not just a small subset of them.

Monday, June 4th, 2018

Progressive Web Games – Mozilla Hacks – the Web developer blog

I was just talking about how browser-based games are the perfect use-case for service workers. Andrzej Mazur breaks down how that would work:

  • Add to Home screen
  • Offline capabilities
  • Progressive loading

Friday, April 6th, 2018

Lazy Loading Images and Video  |  Web Fundamentals  |  Google Developers

Jeremy Wagner offers a deep dive into lazy loading images (and video) with some advice for considering the no-JavaScript situation too.

Wednesday, February 14th, 2018

AMP: the missing controversy – Ferdy Christant

AMP pages aren’t fast because of the AMP format. AMP pages are fast when you visit one via Google search …because of Google’s monopoly on preloading:

Technically, a clever trick. It’s hard to argue with that. Yet I consider it cheating and anti competitive behavior.

Preloading is exclusive to AMP. Google does not preload non-AMP pages. If Google would have a genuine interest in speeding up the whole web on mobile, it could simply preload resources of non-AMP pages as well. Not doing this is a strong hint that another agenda is at work, to say the least.

Tuesday, January 16th, 2018

How To Make A Drag-and-Drop File Uploader With Vanilla JavaScript — Smashing Magazine

A step-by-step guide to implementing drag’n’drop, and image previews with the Filereader API. No libraries or frameworks were harmed in the making of this article.

Friday, January 5th, 2018

Can Preload Cut the Mustard? | Filament Group, Inc., Boston, MA

Ooh, this is clever! Scott shows how you can use rel="preload" to conditionally load JavaScript (say, for screens above a certain size). The browser support isn’t quite there yet, but the thinking here is smart.

Saturday, November 18th, 2017

Using SVG as placeholders — More Image Loading Techniques - JMPerez Blog

Here’s a clever to technique to improve the perceived performance of image loading with a polygonal SVG placeholder.

Monday, October 2nd, 2017

eBay’s Font Loading Strategy | eBay Tech Blog

Here’s the flow that eBay use for the font-loading. They’ve decided that on the very first page view, seeing a system font is an acceptable trade-off. I think that makes sense for their situation.

Interestingly, they set a flag for subsequent visits using localStorage rather than a cookie. I wonder why that is? For me, the ability to read cookies on the server as well as the client make them quite handy for situations like this.

Monday, September 25th, 2017

Network Information API

It looks like this is landing in Chrome. The navigator.connection.type property will allow us to progressively enhance based on connection type:

A web application that makes use of a service worker to cache resources during installation might have different bundles of assets that it might cache: a list of crucial assets that are cached unconditionally, and a bundle of larger, optional assets that are only cached ahead of time when navigator.connection.type is 'ethernet' or 'wifi'.

There are potential security issues around fingerprinting that are addressed in this document.

Why it’s tricky to measure Server-side Rendering performance

A good analysis, but my takeaway was that the article could equally be called Why it’s tricky to measure Client-side Rendering performance. In a nutshell, just looking at metrics can be misleading.

Pre-classified metrics are a good signal for measuring performance. At the end of the day though, they may not properly reflect your site’s performance story. Profile each possibility and give it the eye test.

And it’s always worth bearing this in mind:

The best way to prioritize content by building a static site. Ask yourself if the content needs JavaScript.

Friday, September 1st, 2017

Progressively Worse Apps

This article makes a good point about client-rendered pages:

Asynchronously loaded page elements shift click targets, resulting in a usability nightmare.

…but this has nothing, absolutely nothing to do with progressive web apps.

More fuel for the fire of evidence that far too many people think that progressive web apps and single page apps are one and the same.

Sunday, August 20th, 2017

If you really dislike FOUT, `font-display: optional` might be your jam | CSS-Tricks

Everyone’s been talking about font-display: swap as a way of taking the pain out of loading web fonts, but here Chris looks at font-display: optional and font-display: fallback as well.

Monday, July 3rd, 2017

Fidget Spinners — Real Life

A look at our relationship with waiting, and how that is manifested in the loading icons in our interfaces.

For me, in my moments of boredom, as I turn to my phone and refresh my social media feed, I imagine that what’s on the other side of the buffering icon might be the content that will rid me of boredom and produce a satisfying social connection. The buffering icon here represents my hopes for the many ways that my social media feeds can satisfy my longings at any given moment. They rarely do, though I believe that we are half in love with the buffering icon here because it represents the promise of intimacy or excitement across the distances that separate us.

Saturday, February 18th, 2017

Base64 Encoding & Performance, Part 1: What’s Up with Base64?

Harry clearly outlines the performance problems of Base64 encoding images in stylesheets. He’s got a follow-up post with sample data.

Tuesday, November 1st, 2016

Web fonts, boy, I don’t know – Monica Dinculescu

Monica takes a look at the options out there for loading web fonts and settles on a smart asynchronous lazy-loading approach.

Tuesday, July 19th, 2016

A Comprehensive Guide to Font Loading Strategies—zachleat.com

A terrific rundown of all your options when it comes to web font loading.

Monday, March 7th, 2016

Infinite Scrolling, Pagination Or “Load More” Buttons? Usability Findings In eCommerce – Smashing Magazine

A good side-by-side comparison of loading techniques, with some clear advice. But pay attention to this note:

While the debate over “Load more” versus infinite scrolling versus pagination has been debated for years, the product loading method shouldn’t be the first thing that most e-commerce vendors spend their development resources on.

Sunday, February 28th, 2016

Preload: What Is It Good For? – Smashing Magazine

A comprehensive overview of rel="preload" which looks very useful indeed …I just wish it wasn’t (like “nofollow”) a nonsensical value for the rel attribute: a resource can’t have a relationship of “preload” to the linking document.

Friday, December 18th, 2015

Building the UX London website by Charlotte Jackson

Charlotte talks through some of the techniques she used when she was building the site for this year’s UX London, with a particular emphasis on improving perceived performance.