SharePoint File System Rules deal with the documentation management aspect of your SharePoint environment – excessive documents and folders may degrade the performance of your SharePoint environment.

Fat Document Rules

These Rules check if the total size of fat documents exceed a certain threshold.

Flat Folder Rules

These Rules check if the number of documents in the folders or root exceed a certain threshold.

Note: Having more than 2,000 of any kind of document within a folder or view can cause poor performance.