Emphasise the need to override poolTimeout when watching

[edmorley]

Hi!

As mentioned here, when watching is enabled (ie the development config with webpack-dev-server) the poolTimeout option should be changed from its default of 500 ms to Infinity to avoid paying the overhead of worker startup on every rebuild.

This is hinted at in a code comment of the examples section of the docs, however it seems that people aren't noticing this. eg:
facebook/create-react-app#4346
jaredpalmer/razzle#587

As such I think it would make sense to call this out explicitly in the usage section of the docs.

[alexander-akait]

@edmorley PR welcome 👍

[jantimon]

Oh - I wish I would have seen this before.
I just stumbled into the same problem:

Removing thread-loader decreased the incremental build duration by over 50% because of the booting phase of the workers.

[jantimon]

@edmorley this is fixed with #52 :)

[alexander-akait]

Done in #52

[edmorley]

Many thanks!