A List Apart

Issue № 371

Improving UX Through Front-End Performance

by Lara Hogan · 31 Comments

Adding half a second to a search results page can decrease traffic and ad revenues by 20 percent, says a Google study. For every additional 100 milliseconds of load time, sales decrease by 1 percent, Amazon finds. Users expect pages to load in two seconds—and after three seconds, up to 40 percent will simply leave. The message is clear: we must make performance optimization a fundamental part of how we design, build, and test every site we create—for every device. Design for performance; measure the results.

The Era of Symbol Fonts

by Brian Suda · 43 Comments

Welcome to the third epoch in web performance optimization: symbol fonts. Everything from bullets and arrows to feed and social media icons can now be bundled into a single, tiny font file that can be cached and rendered at various sizes without needing multiple images or colors. This has the same caching and file size benefits as a CSS sprite, plus additional benefits we’re only now realizing with high-resolution displays. Discover the advantages and explore the challenges you’ll encounter when using a symbol font.

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