One of the most common problems I see in Angular projects is bundle size growing way faster than expected.
At first, everything feels fine, then the app grows, dependencies pile up and suddenly your first load is slow, your Lighthouse score drops and users start noticing.
Here are some practical ways to optimize Angular bundle size.
1. Lazy load everything that makes sense
A lot of apps still ship too much code upfront.
Feature modules, admin panels, dashboards or rarely used routes should be lazy loaded so users only download what they need. This alone can make a huge difference.
2. Audit third-party dependencies
Some libraries look small but pull in a lot of extra code. Date libraries, UI kits and utility packages are usually the biggest offenders. Always check if you really need the whole package.
3. Whatch for duplicated imports
It's easy to accidentally import the same heavy dependency in multiple places. This can bloat the final bundle more than expected. Bundle analyzers help a lot here.
4. Use standalone components when possible
Angular's newer architecture can reduce unnecessary module overhead and improve tree-shaking
5. Optimize assets too
Images, fonts and icons are part of your load time. A perfectly optimized Js bundle can still feel slow if assets are heavy
Most Angular performance issues don't come from Angular itself. They come from how the app grows. Bundle size is one of the first places where that shows up.
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