Generating source maps slow the build significantly, should they be opt-in?

[luke-j]

Is your feature request related to a problem? Please describe.
I'm looking to optimise the time taken by build-storybook. Simply setting the devtool webpack option to undefined reduces my build times by half.

Describe the solution you'd like
I'd argue the average storybook user would benefit more from faster builds than they would from source maps. Therefore, I think source maps should be an opt-in feature due to the performance gains in not generating them. Obviously this might be controversial, so I'd love to hear any thoughts on this.

Describe alternatives you've considered
N/A

Are you able to assist bring the feature to reality?
Sure!

[luke-j]

Actually, I'm going to have a think on this.

[shilman]

I ran an experiment on #13058 and found a small improvement. cc @ghengeveld @ndelangen

After setting devtool undefined:

start.time.previewWebpack,8710
start.time.managerRender,10259
start.time.previewRender,10847

Before:

start.time.previewWebpack,9180
start.time.managerRender,10885
start.time.previewRender,11445

[stale]

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