"/home/yossef/notes/git/projects/maplibra/observability/Startup Perf and Budgets.md"

path: maplibra/observability/Startup Perf and Budgets.md

- **fileName**: Startup Perf and Budgets
- **Created on**: 2026-06-16 00:48:42

Startup Perf and Budgets

Migrated from: obs_vault

Parent: ./Runtime Flags and Observability.md

This note covers startup performance measurement and the budgets used to judge it.

Main Source Files

• src/bootstrap/startup-perf.js
• src/bootstrap/perf-budget.js
• scripts/ci-routing-perf.js
• scripts/record-startup-baseline.js
• docs/perf-baseline.md

What It Does

• Tracks performance marks, measures, and long-task observations.
• Evaluates summarized performance against a small budget object.

Why It Matters

• This is how the app knows when startup got too slow or too busy.

Risks

• Long-task observation is browser-dependent, so not every environment can collect the same data.
• The budget evaluator only checks a couple of summary fields, so it is intentionally narrow.

See Also

• ./Rollout Telemetry.md

• ./Observability Risks.md

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