SAK-19668 has introduced a performance issue when a GB is linked to multiple T&Q's. Performance should be checked for all linked GB items: T&Q, Assignments, etc
This has caused a significant performance issue when loading a gradebook that has multiple T&Q's linked.
In our case, this method accounts for 84% of 15 second load when hitting this method stack:
The course only has 15 T&Q in the GB and 7 assignments linked and 12 normal GB items but takes 15 seconds to load.