I been working on something performance intensive lately, one feature of it 
require me to calculate the time gap between operation which require 
time.Now to make time marks.

After I benchmark time.Now on my computer, I found that the time.Now takes 
about 3758 ns to perform one operation, which is not very fast. The 
benchmark is here 
<https://gist.github.com/reinit/82608ab20e5aac3bd3c1eb5a8f78d23c> 
(benchmarked on my Ubuntu 18.04 LTS machine).

So, I want to know is that normal to be this slow? If it is (slow), then 
does there is an alternative way to to that?

Thank you!

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