Plan a load test
Back3. What that would mean
One pass takes
2.741s
median of 7 past run(s)
Projected passes
654
65.4/min
Each user does
218
passes in the window
about 654 passes if the application keeps up at 2.7s 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.