The so-called 'speed of gravity' has been the source of some controversy over the years. The anti-relativity fraternity maintains that the speed of gravity must be infinite, i.e., that gravity acts instantaneously over any distance. Relativists, on the other hand, maintain that no influence propagates faster than the speed of light and that gravity is no exception.

This Relativity 4 Engineers article gives a brief overview of how the 'controversy' is resolved.