You may specify a port setting and file cache folder for Proxy to use. The Proxy file cache is used to cache frequently accessed ...

You may specify a port setting and file cache folder for Proxy to use.  The Proxy file cache is used to cache frequently accessed version control resources so that remote sites can communicate more efficiently with TFS.  You should place this directory on a disk with at least 50GB of free space.  For large or performance-intensive TFS installations, it is not recommended that you store your cache on the Windows system drive.