NOT all reports allowed by number of processes and connections on the server are being executed. Usually it allows only one report (or just few) not following the set number of processes and connections on the server. All the rest is pending, so Cognos is queuing much more than necessary and not allowing enough request being executed. Request are still being balanced on the server within the server group in routing rule (that works correctly). Just the number of reports executed is much lower when this parameter yield chunk is in place.
So for example, if this burst report has 10 burst outputs, you could set the parameter to 5, so that each batch install will take 5 each.
From Administration Console > Status tab > select "System", in scorecard, select MonitorService and add "Advanced settings" ms.loadbalance.yield.chunk = (number)
28 September 2021