As the order volume increases on your Commerce sites, you can optimize checkout performance and order processing by enabling the following store configuration options:
Asynchronous indexing—Enable this option to prevent database locks and slowed processing that can occur when large numbers of orders are placed simultaneously.
Asynchronous email notifications—Enable this option to speed up checkout performance by sending checkout and order processing email notifications at designated intervals instead of sending them immediately.
Enable Archiving—Enable this option to improve the performance of orders, invoices, shipments, and credit memos, and keep your workspace free of unnecessary information, so you can focus on current business. See Enable archiving.