Is the delay related to the warning to not opertate the iDrive while driving? That does stay on a screen for a bit if you don't acknowledge it. The warning screen overrides the backup camera.

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[B]2014 Cayenne Turbo S[B]
2007 X5 4.8 - Titanium Silver , Black Leather, Premium, Prem Sound, Sport, Rear Climate, Heated Seats, Running Boards, Lux H8, GP Thunder Fogs
2003 BMW Z4 3.0si (retired)