parserOptions slow down linting significantly

[luixo]

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):

Linter configuration	Time
ESLint with parserOptions	15s
ESLint without parserOptions	3s

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

Versions

package	version
@typescript-eslint/eslint-plugin-tslint	1.4.1
@typescript-eslint/parser	1.4.0
TypeScript	3.3.3
ESLint	5.14.1
node	8.9.4
npm	5.8.0

[OCJvanDijk]

Duplicate of #243 I think

[armano2]

Duplicate of #243

[bradzacher]

It's a known issue because of eslint runs each file isolated, so we're currently paying the initialisation cost of the type checker in every single file (which is slow and means a lot of duplicated work).

Tracked in #134, #243