The ShareGate migration tool periodically crawls your connected SharePoint environments to get information on your sites and settings.
This information is preserved in a local cache that the app can use to speed up your operations.
When you have this setting turned on in your report options, the app will return results from the local cache instead of directly probing your environment. This will speed up the action considerably.
After selecting the report target(s), toggle on Use local cache from the report Options screen.
Toggle off Use local cache if you need to get the most up-to-date information in your report.
Note: The Permission matrix report does not have the option to use the local cache.