Webpack 2 Dynamic Imports are Very Slow

[gaearon]

While we officially support dynamic import() proposal, it is reported to have significant build performance issues (#2172 (comment), webpack/webpack#4636).

We are going to de-emphasize their support in the documentation until Webpack fixes them. I will disable the require.ensure deprecation, and will track re-enabling it in this issue.

[gaearon]

Setting this up as needing contributions. Specifically, we need somebody to help Webpack folks in webpack/webpack#4636 reliably reproduce the performance issue.

[ingro]

Release 2.6.0. of webpack improved the handling of import, maybe the dependency could be updated in react-scripts too?

[gaearon]

Yea, we plan to bump to 2.6.0. Want to send a PR?

[ingro]

Sure, that seems an easy enough PR to start with :P

[gaearon]

[email protected] now use Webpack 2 which supports import hints: webpack/webpack#4807 (comment).
Please give it a try!