How to debug imports to check startup time during imports

Hello, I want to debug my imports to understand how long it takes to load all my routes and everything else in startup time on the client.

There is any way to activate logs about that? I want to see something like that:

import X start - Thu Mar 16 2017 13:21:49 GMT+0000 (GMT)
import X end - Thu Mar 16 2017 13:21:51 GMT+0000 (GMT)

or like that

import X took - 0.12ms

My problem is not the download time because I’m using it as a cordova app, my problem is to reduce the time starting up and I think I can reduce that with nested imports but I don’t want to do that just guessing.

Any other suggestion to improve the startup time is welcome but we already did a lot of tests in others areas.