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Ionic 2 app takes too much time to load even build with --prod flag

change prefferance in config.xml

    <preference name="SplashMaintainAspectRatio" value="true" />
    <preference name="FadeSplashScreenDuration" value="0" />
    <preference name="SplashShowOnlyFirstTime" value="false" />
    <preference name="SplashScreen" value="screen" />
    <preference name="AutoHideSplashScreen" value="false" />
    <preference name="SplashScreenDelay" value="3000" />
    <preference name="ShowSplashScreen" value="true" />
    <preference name="ShowSplashScreenSpinner" value="false" />
    <preference name="FadeSplashScreen" value="true" />

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