Build Times measures the duration of compilation, linking, and artifact generation for both full and incremental builds. Long build times create idle wait periods that fragment developer focus and slow down the inner development loop. Tracking this metric helps teams prioritize investments in build tooling, caching strategies, and modularization.
Duration of compilation and artifact generation. A direct floor for the inner development loop.
CRITICALLY AMPLIFIED: Build times grow linearly with codebase size unless incremental builds are enforced. Google's 2B-line repo requires distributed execution across hundreds of thousands of cores. Without smart builds, developer productivity in a monorepo effectively hits a wall.
Codebase complexity grows superlinearly. Google needs distributed execution across hundreds of thousands of machines for their 2B-line codebase.
Build is 30–60% of total CI time.
Long builds create micro-interruptions compounding to hours.
Even 2-min builds trigger email/Slack checks, breaking flow.
Daily frustration from waiting, compounding as codebase grows.
Each PR requires multiple builds (dev build + CI builds + review iterations). 10-min build × 10 iterations = 100 min lost.
Tangled deps prevent incremental builds.
Complex dep trees slow resolution.
More code to compile. Scales linearly+ without smart tooling.
Cached build artifacts skip compilation entirely. Remote caching shares across all developers and CI agents.