Slower compilation when using @ngtools/webpack@7.1.0

[filipesilva]

Initially reported in angular/angular#26674 (comment) by @sod

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hm indeed, just updating ngtools gives me the slowdown. Also using angular 7.1 with old ngtools 7.0.7 is significantly faster.

versions	1st run	2nd run	3rd run	4th run	5th run
@angular 7.0.4, @ngtools 7.0.7	31s	15s	7s	5s	5s
@angular 7.0.4, @ngtools 7.1.0	29s	14.5s	15.5s	12s	12s
@angular 7.1.1, @ngtools 7.1.0	29s	13.5s	13.5s	15s	16s
@angular 7.1.1, @ngtools 7.0.7	28s	12.8s	7s	5s	4.2s

[sod]

this is how the chart looks in the 4th run with 7.0.7

and this with 7.1.0

The 7.0 log is 9MB, the 7.1 log is 75MB :D

[sod]

Seems like diagnostics runs even though that should run in a seperate process?

[sod]

I guess #12824 caused this? I'm not sure if this is the intended behavior. An opt-out would be nice.

[hccampos]

Just another data point here:

Angular	ngtools	1st	2nd	3rd
@angular 7.1.1	@ngtools 7.0.7	25317ms	5131ms	4316ms
@angular 7.1.1	@ngtools 7.1.0	36403ms	27959ms	27833ms

[RidhwanDev]

Hi, How can i downgrade @ngTools to 7.0.7?

Thanks

[sod]

‘npm i @ngtools/webpack@7.0‘