- Understand the performance characteristics of the REST API.

- Optimise your requests and pay attention to errors.

What? No, seriously- Crossref periodically releases[public data file](https://www.crossref.org/blog/new-public-data-file-120-million-metadata-records/) of all the metdata that is available via our public API. You can download this file from[Academic Torrents](https://academictorrents.com/) with your favorite torrent client and do a lot of work locally if you want to. At the very least, having the local file will allow you to focus on using the API only for metadata records that have been updated since the last public data file was released.