It takes nearly one minute to start dva new test, after dva upgrade. Why?

upgraded dva-cli

dva -v
//dva-cli version 0.9.2

{
  "private": true,
  "scripts": {
    "start": "roadhog server",
    "build": "roadhog build",
    "lint": "eslint --ext .js src test",
    "precommit": "npm run lint"
  },
  "dependencies": {
    "dva": "^2.2.3",
    "react": "^16.2.0",
    "react-dom": "^16.2.0"
  },
  "devDependencies": {
    "babel-plugin-dva-hmr": "^0.3.2",
    "eslint": "^4.14.0",
    "eslint-config-umi": "^0.1.1",
    "eslint-plugin-flowtype": "^2.34.1",
    "eslint-plugin-import": "^2.6.0",
    "eslint-plugin-jsx-a11y": "^5.1.1",
    "eslint-plugin-react": "^7.1.0",
    "husky": "^0.12.0",
    "redbox-react": "^1.4.3",
    "roadhog": "^2.0.0"
  }
}

then npm start until you open the browser for nearly a minute. Why?

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