Hi
Max 2021.3, daily builds starting from the 2020-12-10, MSE works much slower than with Corona 6. Each selection of material takes more time to get it into the Parameter Editor. And it gets even worse if IR is active. Sometimes during IR after different kinds of operations with materials Max is hanging for 5-10 minutes, sometimes Max doesn't get back to work after 15 minutes of hanging (I couldn't wait longer and restarted Max).
At the moment I work with the same scenes using Corona 6 and everything is working fine, so there are no problems in those scenes.
BTW, Corona 6 starts render the scenes saved with mentioned DB only after resetting Corona, otherwise Max is crashing when render starts.