I have a global teacher assigned. In one of the courses, there are 400 students.

When the teacher tries to view the participants list, it takes a long time to load (loads ok) and I see

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 6815786 bytes) in Unknown on line 0

At the bottom of the page. When logging in as admin and viewing this participants list, I have no problem. I checked the SQL log, apart than seeing all the user level context paths gets updated every time, I do not see anything strange going on.