Merge pull request #8488 from tknippenberg/ShrinkMPRBasics

Added basic steps for shrinking MPR

Author: MariaShaposhnikova

content/en/docs/refguide/version-control/version-control-troubleshooting/repository-size.md

@@ -52,6 +52,14 @@ This means that when you change one document, for example a page, that only the
 Manually modifying files belonging to the  [*.mpr* storage format](/refguide/version-control/#mpr-format) such as the *.mpr* file or the *mprcontents* directory (for example, when resolving file conflicts through third-party tooling), will lead to a corrupted state. To recover from a corrupted state a previous commit will need to be restored.
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+#### Decreasing MPR File Size
+
+When a file exceeds the Git compression threshold, 512 MB by default, Git will store a full copy of the file with each new revision instead of only storing the delta. This results in extremely rapid repository growth with both client and server-side consequences.
+
+As the Mendix model is stored in a single file, this threshold can be exceeded by the *.mpr* file. To decrease the MPR file size, you consider doing the following:
+* Remove [excluded and unused documents](/refguide/dev-best-practices/#excluded-and-unused-documents) – If you have a large number of unnecessary documents in your app model, this can significantly increase the size of the MPR file.
+* Decrease duplication in pages – If you have a number of pages featuring the same content, such as an advanced datagrid, consider extracting this piece of logic to a widget. Reusing a widget on multiple pages prevents the data from being saved several times and can have a large impact on the size of the MPR file.
+
 ### Working with a Large Repository Size
 
 When cloning an app, the default behavior of Git is to download the full history. As Mendix uses different folders on disk for different branches, downloading full history is done for each branch. To mitigate that, Mendix uses local cloning for subsequent branch downloads. When cloning a new branch, data from a local branch you already have is used to reduce data that needs to be downloaded.