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# Environment variables

Betty reads the following environment variables:

- `BETTY_CACHE_DIRECTORY`: The path to a directory for Betty to use as its application cache. Defaults to `.betty` in the current user’s home directory.

- `BETTY_CONCURRENCY`: The concurrency factor expressed as an integer. Defaults to the number of CPU cores. Set to `1` to disable concurrency altogether. Example: `BETTY_CONCURRENCY=4`.