Done on rioc:

Used 100000 random nodes (results are in seconds):

'ls' use-case
timings:
min value: 1.484E-6
max value: 0.004627425
average: 9.39736876000001E-6
standard deviation: 5.085606713128116E-5
timings normalized:
min value: 4.224066444313648E-8
max value: 4.21332E-4
average: 1.8379861202955601E-6
standard deviation: 5.714314778404074E-6

'ls -R' use-case
timings:
min value: 2.242E-6
max value: 5.200463236
average: 0.0011163419848600061
standard deviation: 0.027347073215305932
timings normalized:
min value: 2.492716225875625E-7
max value: 0.005658732025641026
average: 2.0451225344530626E-6
standard deviation: 1.8091049842639734E-5