Add rate limiting for sorting

**Feature request**
It would be great to have compression for validation.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_compression` with default `false`.

First resolve the mismatch between the title, which mentions rate limiting for sorting, and the body, which requests compression for validation. No file or test is named; inspect the project's configuration handling and the relevant sorting or validation entry points, then confirm which behavior and default setting should be covered before defining done.

Written by the indexing model from the issue text.