How do I configure Group Policy to apply folder redirection settings to users who access the local network remotely?

Start Group Policy Editor (GPE), and load the policy in question (you can also right-click the Active Directory--AD--container that the policy applies to, select Properties, select the Group Policy tab, and click Edit).

Navigate to Computer Configuration, Administrative Templates, System, Group Policy.

Double-click "Folder Redirection policy processing."

Select Enabled.

Select the "Allow processing across a slow network connection" check box. (You can also double-click "Group Policy slow link detection" to set what constitutes a slow link.)
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Click OK.

Select Enabled to set the connection speed (500Kbps by default).

Click OK.

Close GPE.