A halving of build time, for even a medium volume project, could be a big cost reduction. If those builds were much longer than 30sec, compounding through a CI pipeline with many changes, leads to much shorter cycle times, faster time to prod, faster to find and fix defects, which translates to much more than just infra cost reduction benefits. I created a visualization once, of the release pipeline for a big project, showing the feedback loops that exist and the compounding effects of small improvements like that. It was eye opening for me, and everybody.