When I add a new value, it appears that it lasts much longer in 'scripting'

[jagged steppe]

https://stackblitz.com/edit/stackblitz-starters-va5rhb?description=An angular-cli project based on @angular/animations, @angular/common, @angular/compiler, @angular/core, @angular/forms, @angular/platform-browser, @angular/platform-browser-dynamic, @angular/router, core-js, rxjs, tslib and zone.js&file=src%2Fmain.ts&title=Angular Starter

[upbeat island]

I would argue about considering "so much longer" (compared to what?) an interval of 52 ms.
Keep in mind that array is tracked by @for, thus on top of the push you got to account its internal logic.

[jagged steppe]

Wouldn't it be possible for scripting to take less time? I think 52ms every time an element is added or modified may not be a good experience.

[upbeat island]

on 2500?

[jagged steppe]

2500 of what?

[upbeat island]

Doesn't the graph says the toal elapsed time of the whole operation can take from 600 to 2500 ms?

[jagged steppe]

oh you meant that

So you are saying that cannot decrease the 'scripting' ms.

[upbeat island]

I say that's doesn't look like the main culprit of the time occured to complete the task.
And in a "highest level environment" like a browser's interpreter it's not easy to strip down a 50ms subtask.