Salesforce Optimizer Report is a feature that evaluates your salesforce instances to determine how your company uses certain Salesforce features and provides a comprehensive quick audit.
It evaluates the following features:
- Field Usage per Object
- Apex Triggers per Object
- Page Layouts per Object
- Record Types per Object
- Active Validation Rules per Object
- Sharing Rules per Object
- Active Workflow Rules per Object
- Administrator Permissions
Unassigned Custom Profiles: Profiles without any active users in them
Unassigned Permission Sets : PermissionSets without any active users in them
You will be able to access Salesforce Optimer from SalesforceA mobile app
More on the types of metrics
Run this report in your Org. Once you get the email and report, run through the recommendations and start optimizing.