We found that we will get tremendous data in our XDB (MongoDB and Reporting). Some of this data was actually not needed as we were not interested in some areas of the website.
So we decided to not record a specific section of the website in XDB.
You will need to add a config file in your app_config folder to overwrite the config.
We added the below file which helped us in filtering a section of the website
File we updated (Foundation.SitecoreTracking.config)