Hi!
We have the exact same issue. The console is slow for the Operator role but is fast for Admin and also for the Read Operator role.
Have had a looong case with MS on this issue. No problems were found but the conclusion ended up being “by design”. The explanation were that the Operator role needs to calculate which views and rules it should have. For the admin and read role this is not the case. No solution from MS.
The console is especially slow when viewing Alert views. So we had to shift som alert views to dashboard alert views instead. All in recommendation from MS.