It's linting the entire CPython codebase and standard library, which is quite large (possibly one of the largest python codebases). But yes, pure python linter

It's linting the entire CPython codebase and standard library, which is quite large (possibly one of the largest python codebases). But yes, pure python linters will be inherently quite a bit slower than a native implementation. The point of ruff is that it's so fast you forget or never even notice it's running. Every change, every little modification, etc. should always be linted with near instant feedback.