You can increase the number of workers for the production build. This is useful when you have more users; usually, a single worker can handle 25 backend users or 25,000 daily website visitors. This formula is not perfect; it can vary based on usage. This option is not free, and increasing the number of workers will increase the price of your Odoo.sh subscription:

These Database Workers are multithreaded, and each one is able to handle 15 concurrent requests. It is necessary to have enough workers to serve all incoming requests as they arrive, but an increasing number of workers does not increase the speed of the requests' processing time. It is only used to handle a large number of concurrent users.