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why does your CI do all that after you start the build if it happens every time? Developer time is expensive.

Scale up ahead of time, so there’s always a machine ready. Prefetch the repository / packages when CI workers start, so they’re already installed before a build is triggered. Use your imagination - CI doesn’t have to suck.




If you scale up ahead of time then it's not really on-demand, that means you have dedicated hardware you're paying much more for.


The marginal cost to keep a large-ish spot instance running 99% of the time is dirt cheap (eg $400/mo to keep one extra c7g.8xlarge running).

If you're paying for an engineering team, that's a rounding error.




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