Blank gray screen on starting cordova app

Hello guys,

I found out all apps built on Cordova have 3-second-long gray blank screen on starting an app.
Why does this happen and is there any way to remove this gray screen permanently?

Apps built on Apache Cordova, Ionic all showed this behavior.
and white splash screen problem happens to all apps built on Cordova as well. Abnormally long white splash screen is always there.

I tried to replace white splash screen with a custom made HTML & CSS3 animation page. I was partly successful but it still shows white splash screen for 0.7 second before moving to animated page.

Please roll out an update regarding this problem. Please permanently remove gray blank screen and white splash screen on start up. Give users an option to completely replace them with an HTML & CSS3 page.

Thanks,