Simple script that uses random coordinates within a specific polygon on a map and performs a large number of requests.
Install depeendencies.
Go to http://apps.headwallphotonics.com/ and choose a set of coordinates that encloses your desired work area.

Enter a set of coordinates on the coordinates_generator.py file as you can see below:
poly = Polygon([(23.109168639786912, -82.38050743782621), (23.08137764519128, -82.38977715218168),
(23.0954317643179, -82.34600350105863), (23.112326343560625, -82.35750481331449)])
Change the number of asynchronous requests you want to perform (2000 in my case):
point = cg.polygon_random_points(cg.poly, 2000)
Change Valhalla's server endpoint you want to test:
valhalla = "http://192.168.59.104:31222/route"