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App js performantes

Start

Install and lauch the app:

yarn
yarn start

You will see that your application has 3 pages:

  • a Home where you can open a popin (from material-ui), displaying a datepicker (from react-dates)
  • a Graph page displaying some nice data (from highcharts)
  • a Code page displaying some very interesting code (from react-syntax-highlighter)

Initial state

Build your application:

yarn build

Lauch the python server that will serve your files with gzip on:

cd build
python ../GzipSimpleHTTPServer.py

Go to http://localhost:8000/, refresh your page with the Network tab opened: you can see that our website loads in 1.20s, and the time to see the first colored pixel (DOMContentLoaded in blue) is of 500ms.

When you launched your yarn build, you could see that the size of your chunks was displayed. Our biggest one has a size of 500Kb gzipped. That is waaaay too much. But why is that ?

I installed for you webpack bundle analyzer to see what contains this chunk.

Launch it:

yarn analyze

Now you can see whats in our bundle. We have several big big libraries: highlightjs is over 188Kb, highcharts 100Kb, moment 65Kb.