* Cells don't grow "faster" than anything. Cell growth is a gradual process. The cell gets larger until it reaches a certain size, and then it divides.

* What forces a cell to divide is its DNA. As the cell grows, the DNA inside it stays the same. Eventually, the cell becomes too large for its DNA to efficiently control and manage all the cell's functions. This triggers the cell division process.

So, the answer is actually the cell's own DNA. The cell doesn't grow *faster* than anything, but the need to maintain a proper ratio of DNA to cytoplasm eventually forces it to divide.