Yes, I already did it by deleting the line "cordovaInterface.pluginManager.postMessage("setupSplashScreen", splashScreen)" and the speed of cold start on Google tests increased by 10-12 times...
That's not what I suggested.
You just deleted this line, and you need to activate automatic hiding of the boot screen. There is a fine-tuning of this parameter somewhere, you can specify the time to wait before hiding this screen.
What I suggested above is relevant, I don't know how else to help you.