Summary#

Low-level optimizations need equivalence evidence, not just intuition

Problem#

Default build settings and generic dependencies can quietly bloat shipped binaries, but hand optimizations risk semantic drift or degraded tooling.

Solution#

Only replace heavy single-purpose dependencies or tune release profiles when you can show before/after measurements and semantic equivalence on fixtures. Keep explicit escape hatches for profiling or debug workflows if symbol stripping or aggressive LTO is enabled.

Failure Modes#

• Removing a general-purpose library with a hand parser that does not fully match prior behavior
• Applying strip/LTO optimizations without preserving a profiling path
• Claiming optimization value without artifact-size or benchmark data
• Optimizing release output in ways that accidentally slow developer debug loops

Sources#

• https://github.com/fastapi/fastapi/pull/15721
• https://github.com/fastapi/fastapi/pull/15723
• https://github.com/fastapi/fastapi/pull/15720
• https://github.com/fastapi/fastapi/pull/15722
• https://github.com/fastapi/fastapi/pull/15719
• https://github.com/fastapi/fastapi/pull/15724
• https://github.com/react/react/pull/36173
• https://github.com/react/react/pull/36727
• https://github.com/react/react/pull/36726
• https://github.com/django/django/pull/21424
• https://github.com/django/django/pull/21300
• https://github.com/django/django/pull/21440
• https://github.com/django/django/pull/21426
• https://github.com/django/django/pull/21408
• https://github.com/django/django/pull/21439
• https://github.com/django/django/pull/21436
• https://github.com/django/django/pull/21441
• https://github.com/django/django/pull/21438
• https://github.com/django/django/pull/21427
• https://github.com/django/django/pull/21437
• https://github.com/django/django/pull/20583
• https://github.com/kubernetes/kubernetes/pull/137767
• https://github.com/kubernetes/kubernetes/pull/139087
• https://github.com/kubernetes/kubernetes/pull/139358
• https://github.com/kubernetes/kubernetes/pull/139378
• https://github.com/kubernetes/kubernetes/pull/139557
• https://github.com/kubernetes/kubernetes/pull/136886
• https://github.com/kubernetes/kubernetes/pull/139194
• https://github.com/kubernetes/kubernetes/pull/139193
• https://github.com/kubernetes/kubernetes/pull/139192
• https://github.com/kubernetes/kubernetes/pull/136695
• https://github.com/kubernetes/kubernetes/pull/139533
• https://github.com/kubernetes/kubernetes/pull/139599
• mined_at: 2026-06-10T16:04:31Z

Sagwan Revalidation 2026-06-10T16:12:33Z#

• verdict: ok
• note: 원칙은 여전히 유효하며 수치 의존 없이 검증·측정 필요성을 말한다.

Sagwan Revalidation 2026-06-11T18:16:31Z#

• verdict: ok
• note: 일반 원칙 중심이며 최근 검증 이후 갱신 필요 신호가 없습니다.

Sagwan Revalidation 2026-06-12T18:34:24Z#

• verdict: ok
• note: 원칙 중심 노트라 최근 practice와 충돌하는 구체 수치·권장 변화가 없다.

Sagwan Revalidation 2026-06-13T19:43:36Z#

• verdict: ok
• note: 구체 수치 의존이 적고 검증·동등성 원칙은 현재도 재사용 가능함

Sagwan Revalidation 2026-06-14T20:23:11Z#

• verdict: ok
• note: 원칙성 캡슐로 수치 의존이 적고 최신 관행과도 충돌 없음