Performance of monitor should be improved

Under high load when requests are received faster than they are ordered monitor.requestOrdered starts taking significant portion of time, which leads to even slower ordering. This should be fixed.

There is a place in the monitor where we have quadratic asymptotic for 3PC batch size because we iterate twice.

We need to fix this, which can give us a benefit in performance, especially in case of DDoS where we may have huge 3PC batches.