ng build --prod --aot --output-hashing none stuck at chunk asset optimization after Angular V 5 upgrade

[rahulrsingh09]

After Upgrading to Angular Version 5 the aot compilation seems to be stuck at 92 % chunk Optimisation for ages.
and Completes after a full 4 mins

Date: 2017-11-03T13:54:26.604Z
Hash: 35cf6c5f7a300435f807
Time: 222890ms
chunk {0} 0.chunk.js () 16.7 kB  [rendered]
chunk {1} main.bundle.js (main) 2.56 MB [initial] [rendered]
chunk {2} polyfills.bundle.js (polyfills) 63.8 kB [initial] [rendered]
chunk {3} styles.bundle.css (styles) 296 kB [initial] [rendered]
chunk {4} inline.bundle.js (inline) 1.36 kB [entry] [rendered]

Any reason for this slowness

[shusson]

I'm seeing the same thing

[finalxcode]

me too

[rametta]

Me too, mine sometimes >9mins, brutal. using angular cli 1.5 and angular v5.0.0

before upgrading to v5, prod build was around 4mins

plz send halp

[rahulrsingh09]

I asked some one from the Angular team they are telling as build optimiser is enabled by default this is causing the prod build to be slower

[wuzhouyang]

Yes, me too. But as the result I have got a smaller bundles.

[theunreal]

Same here.
just using ng build --prod. Angular & Angular-cli 5 final.

[codech3ry]

I'm facing the same issue and its the same with --build-optimizer=false

[lakshmanavula]

Yes, me too, It is taking 2-3 min simple project and In the lager project taking 10+ Min

[filipesilva]

Heya all,

With 1.5, --build-optimizer is turned on by default on production builds. It does make them slower but should result is smaller bundles.

There were some memory problems that we have meanwhile fixed. Can you try using 1.6.0 instead?

[theunreal]

Thanks @filipesilva, I will check the performance of 1.6.0 against 1.5.0 without the build optimizer and will share the result here.

[theunreal]

@filipesilva This build --prod is still extremely slow,
Time: 261184ms