I have read a number of books on quantum mechanics and I am now at peace with the idea that the wave-function of an electron instantaneously populates the universe with finite probabilities that the electron will be detected at a given point, if a measurement is conducted at that point. However, going back to the double-slit experiment, it would seem that, as the wave-function is instantaneous (i.e. greater than the speed of light), then an electron would be detected at the screen instantaneously. This seems to conflict with the concept that the electron cannot transit from the source to the screen faster than the speed of light. What am I missing?