The 2000x number is based on a pathological directory in black's repo https://github.com/psf/black/tree/main/profiling https://github.com/psf/black/tree/main/pr

The 2000x number is based on a pathological directory in black's repo https://github.com/psf/black/tree/main/profiling https://github.com/psf/black/tree/main/profiling which make duplicate-code really slow and a fix was done in pylint 4.1.0 according to pylint's maintainer.