The Containers panel sets preferences for using the Container feature; in particular, you can use the Status and Update settings to improve performance.

The frequency, in seconds, with which 3ds Max checks the source container file for updates.
Choose an option to define how to display the status (Unsaved, Open, and so on) of containers as text labels in the viewports:
When on, 3ds Max does not monitor the source file to determine whether it has changed since inherited.
These settings determine whether 3ds Max performs an update automatically when you load or reload a container.
When on and you use the Load command on an unloaded container, 3ds Max automatically updates the container from the source file.
When on and you use the Reload command on a local container, 3ds Max automatically updates the container from the source file.
This can be useful when you’ve inherited a container that uses the Only Add New Objects or Anything Unlocked rule and saved a local definition; the inherited content can still be updated from the source container.