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If your externals are large repositories, then we recommend not using this feature (set to Ignore). The externals feature does have a significant performance overhead, because we need to checkout the externals with each checkout of the main repository. If those externals are rarely changing, this is a lot of wasted IO. In this case you may be better of off creating seperate repositories in Continua CI for each external svn repo, you can then use the Source Rules on the stage to map the external repositories into the correct location in your build's source folder. This is much more efficient, since the externals only need to be checked out when they change.