Editing a Role is slow or impossible with many entities

[billabongrob]

What do you want to improve?

This type of field is incredibly slow compared to whatever type is used in the Scaffolders MultiEntityPickers.

What is the current behavior?

The field for the User or Group picker within an RBAC role is incredibly slow to load as the users and groups load - often causing the dreaded Chrome "Page is not responding, kill or wait"

~ 2k users and ~5k groups for what it's worth.

What will the new behavior be?

The User/Group selection field type has drastically improved performance.

Environment

"@janus-idp/backstage-plugin-rbac-backend": "^2.1.3"