Angular Performance Goes Beyond Bundle Size: Runtime Bottlenecks Matter Too

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Reducing an Angular application's JavaScript bundle size is a valuable optimization, but it addresses only the loading stage of performance, not runtime behavior. A smaller bundle can speed up initial load, yet issues like browser freezes during heavy data rendering may persist unresolved. Developers must consider each performance stage separately — from resource download and JavaScript parsing to Angular bootstrapping and user interaction — since optimizing one stage does not automatically improve others. Lazy loading routes helps by deferring code delivery until a user actually navigates to a feature, avoiding unnecessary upfront downloads. Third-party dependencies also silently inflate bundle size and startup time, making careful library selection equally important to overall performance.

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