In order to reduce the time it takes to provision resources, Terraform uses parallelism. By default, how many resources will Terraform provision concurrently?

5 is not the default parallelism value; Terraform uses 10 concurrent resource operations out of the box.

50 concurrent operations is not the default and could overwhelm provider API rate limits; it is not Terraform's out-of-the-box behavior.

Terraform defaults to a parallelism of 10, processing up to 10 resource create, update, or destroy operations simultaneously while still respecting dependency ordering from the graph. This value can be overridden using the -parallelism=N flag with commands such as terraform apply or terraform plan when a different concurrency level is needed.

20 is not the default parallelism value for Terraform resource provisioning.