VSCode extension feels slow, especially compared to eslint

[tarngerine]

Describe the bug
I only have a single eslint rule, which runs very quickly in eslint. Porting it over to betterer, it runs way slower in VSCode.

Also, it only runs on save — eslint runs as you type

To Reproduce

betterer.ts:

import { eslint } from "@betterer/eslint";

export default {
  "require JSDoc for exports": () =>
    eslint({
      "jsdoc/require-jsdoc": [
        "warn",
        {
          publicOnly: true,
          require: {
            ArrowFunctionExpression: true,
            ClassDeclaration: true,
            ClassExpression: true,
            FunctionDeclaration: true,
            FunctionExpression: true,
            MethodDefinition: true,
          },
          contexts: [
            'CallExpression[callee.name="observer"]', // observer(SomeComponent)
            'CallExpression[callee.name="suspenseObserver"]', // suspenseObserver(SomeComponent)
            'MemberExpression[object.name="React"][property.name="forwardRef"]', // React.forwardRef
            'MemberExpression[object.name="React"][property.name="createContext"]', // React.createContext
            'Identifier[name="styled"]', // styled.div, styled()
            "TSInterfaceDeclaration", // interface
            "TSTypeAliasDeclaration", // type
            "TSEnumDeclaration", // enum
          ],
          enableFixer: false,
        },
      ],
    }).include("./client/src/**/*.{ts,tsx}"),
};

Expected behavior
To be as fast as eslint:

CleanShot.2023-08-23.at.12.01.04.mp4

Actual behavior
Takes a split second longer, and also requires saving

CleanShot.2023-08-23.at.11.58.27.mp4

Versions (please complete the following information):

• OS: MacOS Ventura latest
• Betterer Version: 4.5.0
• Node Version 18.17.0