[14.0.0-rc0] very slow compared to v13

[chrisnruud]

Hello. We are in the early proess of migrating our common eslint libraries to eslint 9 and when using the rc - version of v14 to consolidate our config, it works like expected, but the execution is several magnitudes slower than the same configuration on v13 / eslint 8 - unless we are doing something wrong in our implementation (just a bare - bones configuration setup is significantly slower) - then we hope that we can be able to either debug or that this is fixed in the release :)

https://github.com/dsb-norge/eslint-config-dsb-vue3-ts/tree/eslint9 for reference