I have this option as well. in my experience it has taken 2-3 minutes to load any page, iirc this is because our cars have an antiquated 2G data connection (like the original iPhone in 2007 that took forever to load webpages)
That is why many new cars (chevy, AUDI, etc.) have adopted 3g/4g data connections so that the can quickly use online services like google maps in real time. Because that is a matter of the actual antennae in our cars, i doubt BMW would be able to speed it up with a software update
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