Some users may get impatient and open multiple windows and tabs with the same large request. For example, they try to retrieve thousands of allocations in "Resource Planning - Allocations" or a similar large portlet and it's taking some time to respond.
In the attempt to get the results quicker, the user opens 5-6 browser tabs with the same request. Or they repeatedly close the tabs when the large portlet still spinning, and open new ones
This is going to make the performance much slower as many requests for the same large query hit the application server at the same time. It can, in some cases even bring a single application server down by leading to OutOfMemory(OOM).