Why do I require the S3 Connector when AWS S3 can be mounted as a file system? - Why do I require the S3 Connector when AWS S3 can be mounted as a file system? - Alfresco - Alfresco Content Connector for AWS S3 - Alfresco/Alfresco-Content-Connector-for-AWS-S3/2.2/Alfresco-Content-Connector-for-AWS-S3/Alfresco-Content-Connector-for-AWS-S3/Content-Connector-for-AWS-S3-FAQ/Why-do-I-require-the-S3-Connector-when-AWS-S3-can-be-mounted-as-a-file-system - 2.2

You can mount S3 as a file system using a third party library, but is not recommended by AWS or supported by Alfresco due to the very poor performance.