We looked at five teams that measured their compute footprint seriously. In four of them, the largest single reduction came from switching something off.
Audit before you optimise
Nightly jobs whose output nobody reads. Retry loops with no backoff. Metrics scraped at ten times the resolution anyone charts. None of that needs a rewrite; it needs an owner willing to delete it.
Language and runtime choices matter, but they arrive with rewrite costs. Turning off a redundant pipeline is free and immediate.
The greenest instruction is the one you never execute.
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