angular: Compiler performance regression

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[ ] feature request
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Current behavior After updating to 2.2.1 or 2.2.3, the a mid-sized app (~50k LOC or so) takes over 90 seconds to bootstrap. In 2.2.0, the same app bootstraps in under 5 seconds.

Expected behavior Time to bootstrap should not take this long.

Minimal reproduction of the problem with instructions The app is using the JIT compiler and includes approximately 30 app NgModules, built with Webpack. It is a sizable enough codebase that makes reproducing in the small difficult.

I have captured a CPU profile from Chrome, screenshot attached below. The green lines are angular. This profile runs 90 seconds.

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: 2.2.1 and 2.2.3

• Browser: all (tested latest Chrome, Firefox, Safari across different operating systems); tested with devtools open and closed

• Language: TypeScript 2.0.9

• Node (for AoT issues): node --version =