o longer have to ship the compiler to the client. And so it happens, the compiler is the largest part of the framework. So it has a positive effect on the download size
Essential Angular: Compilation
Victor Savkin
1948

Danger zone. This is not entirely true, since the auto-generated code during AoT can easily become bigger in size than the compiler’s code size. I.e., the downloaded size of the application is likely to increase with AoT. Anyway, the app will likely be 2–3 times faster with AoT!

https://www.softwarearchitekt.at/post/2017/02/01/5-things-you-wouldn-t-necessarily-expect-when-using-aot-and-tree-shaking-in-angular.aspx

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