PIC18F2550 with 20MHz Crystal?

Hi, I just want to ask some simple questions.
1) Can I use 20MHz Crystal on PIC18F2550 in Synthex 2.5 PCB.
2) Whether with this I can reduce the latency?
Thanks
PS: Sorry for my bad english
1) Can I use 20MHz Crystal on PIC18F2550 in Synthex 2.5 PCB.
2) Whether with this I can reduce the latency?
Thanks
PS: Sorry for my bad english