Practical limit to group size for assigning role

[Michael Searle]

I'm running into some issues with role assignment (add and remove) via a group where the group membership exceeds thirty-thousand members. 

I want to know whether you have experience or knowledge relating to this. Is there a practical size limit for groups that assign roles? Is there a best practice for keeping group membership size below a certain threshold? If you have encountered this issue, how did you divide group membership to overcome it?

Thank you.

[Nikhil Bajaj9]

My POV- Assigning role directly to user is not a best practice so you can try few things

1) if all users are not Active in the group - Remove inactive users from group

2) If group is having multiple roles- you can divide roles in 2 or 3 different groups and add users based on the requirement.

3) In case all roles are required in the group and there are many users- you can create 2 similar groups with different names and divide users in those groups.