Security Limit Maximum value
|Limit||Maximum value||Limit type||Notes|
|Number of SharePoint groups a user can belong to||5,000||Supported||This is not a hard limit but it is consistent with Active Directory guidelines. There are several things that affect this number:
|Users in a site collection||2 million per site collection||Supported||You can add millions of people to your Web site by using Microsoft Windows security groups to manage security instead of using individual users.
This limit is based on manageability and ease of navigation in the user interface.
When you have many entries (security groups of users) in the site collection (more than one thousand), you should use Windows PowerShell to manage users instead of the UI. This will provide a better management experience.
|Active Directory Principles/Users in a SharePoint group||5,000 per SharePoint group||Supported||SharePoint Server 2010 enables you to add users or Active Directory groups to a SharePoint group.
Having up to 5,000 users (or Active Directory groups or users) in a SharePoint group provides acceptable performance.
The activities most affected by this limit are as follows:
|SharePoint groups||10,000 per site collection||Supported||Above 10,000 groups, the time to execute operations is increased significantly. This is especially true of adding a user to an existing group, creating a new group, and rendering group views.|
|Security principal: size of the Security Scope||5,000 per Access Control List (ACL)||Supported||The size of the scope affects the data that is used for a security check calculation. This calculation occurs every time that the scope changes. There is no hard limit, but the bigger the scope, the longer the calculation takes.|