When a user is accessing a SharePoint Online, he is first redirected to Azure AD for authentication.
If the company is using ADFS to manage authentication, Azure AD then redirected to the ADFS server for authentication.
This can lead to slow authentication process for end-user (external users when sharing content with them).
With SharePoint Online you can speed up the process by activating the use Azure Active Directory home realm discovery page.
To enable this acceleration feature, you need to connect with PowerShell to your tenant
To disable the acceleration, just set the EnableGuestSignInAcceleration to $false and the SignInAccelerationDomain to “”
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