Angular 2 is massive. Just to create a “hello world” application, we might end up with a bundle of more than 2.5 MB. If you have a 50 mbps internet connection, that might not seem problematic but most people don’t have that privilege. What’s more, Angular 2 has now morphed into a multi-platform framework with the goal of creating mobile applications from the same codebase as your web application. Downloading 2.5 MB in an unreliable 3G connection with high latency is a big deal.
Source: Optimize your Angular 2 Application with Tree Shaking
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