Insane mode on-premises offers significant improvements to migration speed by using the Server Extension for faster file uploads and save time.
To enable the Insane mode on-premises (2007, 2010, 2013, 2016, and 2019), follow these two steps:
Step 1 - Install the Server Extension
Install the server extension (version 1.8.3 or greater) on your source and destination servers.
If your farm has multiple web front-end servers (WFEs), the extension must be installed on all WFEs.
Note: You can install it on either the source or destination only and still benefit from the extra speed, but you will achieve even better performance if you install it on both the destination and source servers.
Step 2 - Activate Insane mode
You can activate Insane mode in two ways:
Option 1
Follow the normal steps to migrate SharePoint content or site objects.
When prompted to select the Copy options, toggle the speed to Insane.
Option 2
Select Settings from the menu, then select Migration.
Under Migration speed, select Insane mode.