A refresh is a frequent operation that happens when you switch between two working copies using the selector from the toolbar of the Working Copy view and when you switch between Syncro SVN Client and other applications. For fast refresh in the Working Copy view the content is cached locally on the first load of a working copy. Later when the same working copy is loaded again in the view or when you switch back to the Syncro SVN Client window the cache is used for detecting the changes between the cached content and the current content from disk. This improves the speed for large working copies because it detects the changes from disk after the last refresh and runs the refresh only for the changes.