Create-react-app: Why is it taking so long to start my app?

[tgreen7]

If you are reporting a bug, please fill in below. Otherwise feel free to remove this template entirely.

Can you reproduce the problem with latest npm?

yes

Description

My app startup time during development using react-scripts start takes an excessive amount of time (> 60s). Also recompiling during development takes a while.

Expected behavior

I would expect the initial build to be under 10s

Environment

Run these commands in the project folder and fill in their results:

1. npm ls react-scripts (if you haven’t ejected): [email protected]
2. node -v: v8.0.0
3. npm -v: 5.0.0

Then, specify:

1. Operating system: macOS Sierra (version 10.12.5)
2. Browser and version: Chrome 58.0.3029.110 (64-bit)

[zaunermax]

Do you have any antivirus program running in the background? I had to disable the real-time file system scan of my anti-virus program which sped up my build and start times.

[Timer]

Can you please provide a project that this reproduces in? We'd love to run some profiling.

[tgreen7]

Here is a simplified version of the app with only a few of the dependencies that we are including and a few files. It is still taking 36s for initial startup (maybe that is normal?)
https://github.com/tgreen7/create-react-app-slow

[zaunermax]

30 seconds is a normal startup time.

[Timer]

Yeah I should've added that it's perfectly normal. I have an application that takes a long time to boot, too.

We are looking into improving this, tho!

[tgreen7]

Alright thanks for the feedback. Just wanted to make sure I didn't have something messing up.

[harshalthakre]

harshal@harshal-Inspiron-3542:~/react-Native/AwesomeProject$ npm start

[email protected] start /home/harshal/react-Native/AwesomeProject
react-native-scripts start

00:25:53: Starting packager...

its taking too long to start...

[iansu]

This project is not related to React Native.