Optimizing

[Jokaste]

In my program "Catch Images.exe" I make jumps to labels which are 16 bytes aligned.
I would like to know to number of cycles it takes and the number of cycles a NOP takes.
Is it possible to have relatives jumps rather than absolutes jumps.
What is faster in that case

xor r8,r8
xor r9,r9

or

xor r8,r8
mov r9,r8

How to avoid stalls in 64 bits, all I read is for 32 bits programming?