[android-developers] why starting a activity cost 5s when i apply a theme to the MsimDialerActivity？？？

why it become so slowly when i add the theme:android:theme="@android:style/Theme.Dialog" to the MsimDialerActivity?

thus,
         <activity android:name="MSimDialerActivity"
                android:permission="android.permission.CALL_PRIVILEGED"
                android:configChanges="orientation|keyboardHidden"
                android:screenOrientation="nosensor"
                android:theme="@android:style/Theme.Dialog"
                >


then, when i press dialer button in the call log fregment it cost 5s that starting the activity.why is it ???


android ersion：ICS

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