After the upgrade to ionic 3.19.0 "Deviceready has not fired after 5 seconds"

After upgrading my app to ionic 3.19.0 and cordova 8.0 I am getting the following problem:

Ionic Native: deviceready did not fire within 5000ms. This can happen when plugins are in an inconsistent state. 
Try removing plugins from plugins/ and reinstalling them.
(anonymous) @ vendor.js:144243
vendor.js:144238 Ionic Native: 

deviceready event fired after 6691 ms

Start up time is now about 10 sec.
Before the upgrade (ionic 3.7.0, cordova 6.5.0) the start up time was about 2.5 sec.
I upgraded plugins as well.
Code remained the same.
I am also using --prod flag (also used it before the upgrade) and it seems like it doesn’t have any effect after the upgrade.

Anybody else encountered similar problem?

Any help is appreciated! :slight_smile: