Plan a load test
Back3. What that would mean
One pass takes
3.956s
median of 7 past run(s)
Projected passes
453
45.3/min
Each user does
151
passes in the window
about 453 passes if the application keeps up at 4.0s each; fewer means it slowed down, which is the result you are looking for
This machine: 15.8 GB RAM and 4 CPU(s): ~400 MB per browser leaves room for about 12 at once.