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Chrome Lite Pages

The Chrome team announced a new feature called Lite Pages that can be activated by flipping on the Data Saver option on an Android device:

Chrome on Android’s Data Saver feature helps by automatically optimizing web pages to make them load faster. When users are facing network or data constraints, Data Saver may reduce data use by up to 90% and load pages two times faster, and by making pages load faster, a larger fraction of pages actually finish loading

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Planning for Responsive Images

The first time I made an image responsive, it was as simple as coding these four lines:

img {
  max-width: 100%;
  height auto; /* default */
}

Though that worked for me as a developer, it wasn’t the best for the audience. What happens if the the image in the src attribute is heavy? On high-end developer devices (like mine with 16GB RAM), few or no performance problems occur. But on low-end devices? It’s another story.… Read article

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Using React Loadable for Code Splitting by Components and Routes

In a bid to have web applications serve needs for different types of users, it’s likely that more code is required than it would be for one type of user so the app can handle and adapt to different scenarios and use cases, which lead to new features and functionalities. When this happens, it’s reasonable to expect the performance of an app to dwindle as the codebase grows.

Code splitting is a technique where an application only loads the code … Read article

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The Client/Server Rendering Spectrum

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The Bottleneck of the Web

Steve Souders, "JavaScript Dominates Browser CPU":

Ten years ago the network was the main bottleneck. Today, the main bottleneck is JavaScript. The amount of JavaScript on pages is growing rapidly (nearly 5x in the last 7 years). In order to keep pages rendering and feeling fast, we need to focus on JavaScript CPU time to reduce blocking the browser main thread.

Alex Russell, describing a prototype of "Never-Slow Mode" in Chrome:

... blocks large scripts, sets budgets for certain

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instant.page

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“the closest thing web standards have to a golden rule”

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Bandwidth or Latency: When to Optimise for Which

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The Ethics of Web Performance

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Fighting FOIT and FOUT Together

Lots from Divya with the setup:

There are 2 kinds of problems that can arise when using webfonts; Flash of invisible text (FOIT) and Flash of Unstyled Text (FOUT) ... If we were to compare them, FOUT is of course the lesser of the two evils

If you wanna fight FOIT, the easiest tool is the font-display CSS property. I like the optional value because I generally dislike the look of fonts swapping.… Read article

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