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Here are ten top best practices that can enable high performance at the Git operation level for large mono repo development teams:

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1. Keep the repository as clean as possible by frequently merging and deleting branches that are no longer needed

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2. Use Tools & Features such as [Partial clone](https://git-scm.com/docs/partial-clone), [Shallow Clone](https://git-scm.com/docs/git-clone#Documentation/git-clone.txt-code--depthltdepthgtcode), [Sparse checkout](https://git-scm.com/docs/git-sparse-checkout), [VS Code Plugin](https://marketplace.visualstudio.com/items?itemName=github.remotehub) and [CodeSpaces](https://github.com/features/codespaces) to improve performance when working with large files & mono-repos 

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3. Optimize your Git configuration for large repo performance eg: disable forks