Permission set groups are a combination of permission sets that grant users access to various tools and functions. Muting permission sets are used to remove access that is granted by other permission sets in the group. However, muting permission sets cannot remove object-level access that is granted by Modify All or View All permissions. Therefore, if a user is assigned to a permission set group that gives them Modify All access to Accounts, a muting permission set that mutes Delete access on Account will not have any effect. The user will still have Modify All access on the Account object, which includes Delete access. Reference: https://help.salesforce.com/s/articleView?id=sf.perm_sets_groups_muting.htm&type=5

To review the performance of a Lightning record page, administrators can utilize two key tools:
Lightning Usage App:
The Lightning Usage App provides insights into user engagement and performance metrics for Lightning Experience.
Within this app, administrators can view specific metrics related to page load times and other performance factors.
This is a helpful resource for tracking usage and identifying potential issues with page speed or performance across the org.
Analyze Button:
The Analyze button is available within the Lightning App Builder when editing a Lightning record page.
By clicking this button, administrators can run a performance analysis on the page layout, which provides specific recommendations for optimizing page load times and improving overall user experience.
The tool evaluates components, their configuration, and potential sources of delay, giving direct feedback on areas to improve.
These two options directly provide performance analysis capabilities for Lightning record pages. The other options listed do not offer direct access to page performance metrics:
Activation Button is used for setting page visibility rules and activating a page, not for performance analysis.
Pages Menu helps in navigating and managing pages but does not provide performance metrics.
Using both the Lightning Usage App and the Analyze button allows administrators to comprehensively review and optimize Lightning page performance for improved user experience.