DEVOURED
Design Systems Should Be Fast by Default
Performance benchmarking of ten popular design systems shows wide variation, with Ionic significantly slower than competitors like Fluent and Carbon.
What: Developer Deno Dell tested common components like 249-country dropdowns and 100-checkbox lists across ten design systems. The findings show that architectural choices in how components render dictate app-wide performance, regardless of user-side optimizations.
Why it matters: Developers often treat design systems as black boxes, but because they define the baseline rendering performance, 'slow-by-default' components create a technical debt that is nearly impossible to fix downstream.
Takeaway: Run synthetic performance tests on your core design system components using tools like Playwright to establish a performance budget for every UI element.
Deep dive
- Virtualization: A technique that renders only the items currently visible in the viewport to maintain 60fps performance in long lists.
- Performance Budget: Pre-defined limits for metrics like time-to-interactive or bundle size that, if exceeded, trigger a CI/CD build failure.
Decoder
- Design System: A collection of reusable components, guided by clear standards, that can be assembled to build any number of applications.
Original article
Slow design system components make every app built on them slow, so performance belongs next to accessibility on the team's priority list. Timing ten popular systems on a 249-country dropdown and 100 checkboxes found Fluent and Carbon quickest to open the dropdown and Ionic by far the slowest. Playwright tests with explicit budgets, virtualized long lists, and published performance numbers keep components fast by default.
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