Why is exporting/importing default ES module properties faster than names module properties?

Question

I\'m reading the Material UI documentation, and it states:

Notice that in the above example, we used: import RaisedButton from \'material-ui/R

Answer 1

The key thing is not whether the module has a default export or not, but the fact that you import a module that includes all the Material UI Components (the material-ui module) instead of the module that includes only the RaisedButton component (the material-ui/RaisedButton module).

To be absolutely clear: We should be using the module that only includes a single component, i.e. material-ui/RaisedButton.