There's no way to stress-test a complex web realtime system without actually running it on the real hardware.
You'd expect very nonlinear behavior between number of users, response time and number of machines used.
Not being a part of Disqus, the only way I see to "predict" performance beyond the load already seen is to try and use past data from the current real system.
You'd expect very nonlinear behavior between number of users, response time and number of machines used.
Not being a part of Disqus, the only way I see to "predict" performance beyond the load already seen is to try and use past data from the current real system.