I am trying to migrate gradually from tslint to typescript-eslint. On my attempt to incorporate @typescript-eslint/tslint/config the linting became extremly slow. Fiddling around with the configuration file, I found out that the problem is in the parserOptions property.
Mine looks quite minimalistic:

parserOptions: {
    project: 'tsconfig.json'
}

I run ESLint several times with and without parserOptions and benchmarked the timings (based on 10 runs):

I'm not sure if that much of a slowdown is unevitable or it's just a malconfiguration of some sort.

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