[cli] Improve startup perf - disable source maps and minification (#5100)
[cli] Improve startup perf - disable source maps and minification (#5100)

Currently on my machine, vercel --version takes 850ms to run. With this change, that execution time is reduced to ~550ms.

The reason is that source maps seem to significantly slow down Node.js execution, compounded by the size of the source map, even if it is not used.

I believe the benefits of this perf improvement outweigh the direct source maps and minification benefits.

If it is felt that direct per-file source maps are necessary for internal errors, then reducing the source map size should be investigated further to improve the runtime performance here.
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