Plan a load test
Back3. What that would mean
One pass takes
5.27s
median of 7 past run(s)
Projected passes
339
33.9/min
Each user does
113
passes in the window
about 339 passes if the application keeps up at 5.3s 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.