Microsoft has released an open source tool called Git Virtual File System (GVFS) on GitHub. GVFS makes it possible to store extremely large files in Git without suffering the usual level of performance slowdowns. The tool virtualizes the files, which allows developers to see what is in the repository without having to download all the code. It also allows them to check out only the files they need, not the entire repository, when making a change.
The company said it has been using GVFS to store the code for Windows, which includes 3.5 million files and 270GB worth of data. Usually, Git repositories larger than 2GB suffer performance slowdowns.