CI/CD & Pipelines
Build Time Regression Detector
Enter baseline and current P95 build times to compute regression percentage, daily time wasted, and annualized developer cost.
No data is transmitted — everything runs locallyTool
Example — 8-min baseline → 11-min current · 40 runs/day
Build time delta
+3.0 min
8 → 11 min p95
Regression %
37.5%
⚠ >20% threshold
Daily time lost
120 min
across 40 runs
Monthly time lost
2640 min
~22 working days
About this tool
Build Time Regression Detector
The Build Time Regression Detector computes regression percentage, daily developer time cost, and annualized cost from baseline vs current P95 build times and run frequency.
• Quantify a build time regression for an engineering productivity report
• Calculate daily time cost of a 30% build time increase across the team
• Set a numeric threshold for a build time regression alert
• Build a business case for build time optimization investment
Affiliate disclosure
Uptime, incident, and on-call management. Better Stack provides status pages, incident management, and on-call scheduling for engineering teams.
View build times with Better Stack
External site · Independent provider · We may receive a commission · Not a recommendation
FAQ
What does this tool tell you?
The Build Time Regression Detector computes regression percentage, daily developer time cost, and annualized cost from baseline vs current P95 build times and run frequency.
What affects the result most?
Build time regression: current_p95 > baseline_p95 × 1.2 is a detectable regression (20% threshold). Common causes: new dependency added, test suite grew, cache miss rate increased, resource contention. P95 vs mean: mean hides flakiness, P95 catches consistently slow but not always slow runs.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.
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