vacuum is the world's fastest OpenAPI linter and quality analysis tool. It's designed as a drop-in replacement for Spectral by Stoplight.
Here is a demonstration of just how fast it is.
To learn more about vacuum: https://quobix.com/vacuum
To read the code: https://github.com/daveshanley/vacuum
Specs used for these tests can be found here:
https://github.com/daveshanley/vacuum/tree/main/model/test_files
The Microsoft Graph API can be found here:
https://github.com/APIs-guru/openapi-directory/blob/main/APIs/microsoft.com/graph/beta/openapi.yaml