Use the time Unix command before another command to know how long it took


For example, instead of just:

node .

You can do:

time node .

to get some basic extra execution time numbers without the need of extra performance calculations from your app’s side.

On Mac OS, the output looks like this:

real    0m1.562s
user    0m1.544s
sys     0m0.167s

But it can vary among operative systems. More information for example on Wikipedia: