Green software: efficiency you can actually measure

Sustainability arguments land better when they arrive attached to a cost reduction.

The levers that matter - Right-size compute; most services run at a fraction of provisioned capacity - Cache aggressively so repeated work stops happening - Compress and lazy-load media, which dominates client-side energy - Schedule batch jobs where and when the grid is cleanest - Delete data nobody reads; cold storage still costs and still emits

Measure per unit of work Track energy or cost per thousand requests instead of totals. Totals grow with the business and hide regressions.

The frontend counts A heavy bundle burns battery on millions of devices. Shipping less JavaScript is the highest-leverage efficiency change most teams can make in a week.

Make it a build gate Bundle-size budgets and per-request cost budgets in CI keep efficiency from being a quarterly cleanup project.