How fast your code executes depends on a number of factors.
The code itself (what all it's doing), the memory & processing speed of your particular machine, what other applications are running at the time, etc, etc.
So... the speed at which it runs can vary noticeably, even on the same machine. There is no way I've ever heard of to actually speed things up, but (as jbeaucaire & Norie point out) there are default settings that slow it down which can be turned off.
And then lastly, it could be the code itself can be rewritten to run more efficiently, which may be able to cut its run time some.