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npm install slow

I have a create react app project with additional dependencies needed for my project.

This is my package.json:
“name”: “my-app”,
“version”: “0.1.0”,
“private”: true,
“dependencies”: {
“auth0-js”: “^9.0.0”,
“enzyme”: “^3.2.0”,
“enzyme-adapter-react-16”: “^1.1.0”,
“es6-promise”: “^4.2.4”,
“isomorphic-fetch”: “^2.2.1”,
“jquery”: “^3.2.1”,
“node-sass-chokidar”: “0.0.3”,
“npm-run-all”: “^4.1.2”,
“query-string”: “^5.1.0”,
“react”: “^16.2.0”,
“react-bootstrap”: “^0.31.5”,
“react-bootstrap-select”: “^0.14.0”,
“react-dom”: “^16.2.0”,
“react-dropzone”: “^4.2.7”,
“react-redux”: “^5.0.7”,
“react-router”: “^4.1.1”,
“react-router-dom”: “^4.1.1”,
“react-scripts”: “1.0.17”,
“react-select”: “^1.1.0”,
“react-test-renderer”: “^16.2.0”,
“redux”: “^4.0.0”,
“redux-form”: “^7.4.2”,
“redux-thunk”: “^2.2.0”,
“superagent”: “^3.8.2”
“scripts”: {
“start-js”: “react-scripts start”,
“start”: “npm-run-all -p watch-css start-js”,
“build-js”: “react-scripts build”,
“build”: “npm-run-all build-css build-js”,
“test”: “run-s -n test-js”,
“test-js”: “react-scripts test --env=jsdom”,
“test-with-coverage”: “react-scripts test --env=jsdom --coverage”,
“build-css”: “node-sass-chokidar --include-path ./src --include-path ./node_modules src/ -o src/”,
“watch-css”: “npm run build-css && node-sass-chokidar --include-path ./src --include-path ./node_modules src/ -o src/ --watch --recursive”,
“storybook”: “start-storybook -p 9009 -s public”,
“build-storybook”: “build-storybook -s public”
“devDependencies”: {
@storybook/addon-actions”: “^3.2.17”,
@storybook/addon-links”: “^3.2.17”,
@storybook/react”: “^3.2.17”,
“babel-preset-es2015”: “^6.24.1”,
“babel-preset-react”: “^6.24.1”,
“bootstrap”: “^3.3.7”,
“bootstrap-sass”: “^3.3.7”,
“storybook-react-router”: “^1.0.1”
“jest”: {
“collectCoverageFrom”: [

“homepage”: “./”,
“proxy”: “http://localhost:8080

npm install takes between 6 - 10 minutes

  1. Is it a normal duration for npm install and my given package.json?
    For me it seems to be a little bit too much for a simple UI project.

  2. In order to see if there are differences I ran npm install with different setups/configurations as follows:
    a. remove ~/.npm directory, remove ./node_modules, run npm install
    Run time: 9m19.950s

    b. keep ~/.npm directory, remove ./node_modules, run npm install
    Run time: 9m17.491s

  3. I also configured a nexus npm proxy registry but no improvements

  4. I also installed locally npm-local registry but no improvements

I would like to understand better npm’s caching mechanism, related to:
~/.npm directory
npm proxy registry
How they related to each other, what are the best configuratoins.

Is it normal to obtain the times specified below? Or I’m doing something wrong?