Hi!
Since we've added theproject: './tsconfig.json' option toparserOptions(to allow @typescript-eslint/prefer-nullish-coalescing rule for instance) the parsing is really really slow. On our project it went from 30s to 11min.
If we exclude.vue files or remove theproject option then it's fast again.

Anyone else went into this issue?
Indeed I ran intotypescript-eslint/typescript-eslint#389 but the performance on our project when excluding.vue files is ok, so it's really the parsing of <script> SFCs imho.

Our eslint parsing options:

parser: 'vue-eslint-parser',  parserOptions: {    ecmaVersion: 2018,    sourceType: 'module',    parser: '@typescript-eslint/parser',    project: './tsconfig.json',    extraFileExtensions: ['.vue'],  }