Multiple Authors on Large Sites
WordPress does have some issues that can cause problems with very large sites and the same is true of the Multiple Authors plugin.
For large sites (over 1000 authors or 100,000 posts), our advice is to test Multiple Authors on a staging site before going live. This is always good advice for any plugin, but we strongly recommend it in this scenario. The data migration can take some time and may need to be run more than once.
Please note the issues don’t apply if you have a large number of users on your site. The issues only applies for very large number of authors or posts.
We’re looking to improve Multiple Authors’ support for large sites in 2020.