Conciseness

The body is dense and expert-level — it never explains what Postgres, N+1, or CDN caching are, and every rule carries a concrete reason, measurement, or path. A few passages run narrative (the §8 incident recap "Slides startup slowness, Analytics paying startup cost…", §10's opening on jank) and could be trimmed, landing it just below the every-token-earns-its-place anchor.

Actionability

Guidance is copy-paste ready and covers the common cases: a complete Drizzle projection with substr truncation, idempotent CREATE INDEX DDL, the anti-pattern plugin body, a runnable bundle-timing `node -e` command, the full trace-startup invocation with flags, and named guards plus exact file/line pointers (`packages/core/src/deploy/build.ts` `:2384-2410`).

Workflow Clarity

Validation is genuinely present — a pre-ship checklist, guard checks (guard:no-boot-data-work, guard:ssr-cache-shell) with a stated limitation, and the trace tool with documented exit codes 1/2 and run conditions — but the body is a rulebook organized by topic rather than a sequenced workflow with per-task checkpoints, so it sits below the explicit feedback-loop anchor.

Progressive Disclosure

Cross-references to sibling skills and repo files (storing-data, real-time-sync, authentication, org/migrations.ts, trace-startup.mjs) are one level deep and clearly signaled, but there is no references/ directory at all: ~390 lines are inline, including content that would fit separate files — the §10 trace-startup CLI usage and the §8/§9 production measurement tables.

Specificity

The description lists multiple specific concrete capabilities — "column projection, indexing hot-path queries, avoiding N+1 and round-trip waterfalls, cheap polling, not recomputing on every read, cold-start artifact size, and loading placeholders that hold still" — comprehensively covering the skill's scope with named techniques rather than generic language.

Completeness

Both questions are explicitly answered: what ("Keep apps and templates loading fast" plus the enumerated "Covers …" list) and when (an explicit "Read when …" clause with concrete trigger phrases). Not a 4 because the when-clause is fully explicit and specific rather than merely present.

Trigger Term Quality

Triggers are natural and situational ("adding a data model", "a list/read action", "a page or sidebar that loads data", "when something loads slowly", "adding a dependency to the deployed server bundle"), but a few common variations users would say — e.g. "slow", "slow page/list", "latency", "performance" — are absent, placing it just below the comprehensive-synonyms anchor.

Distinctiveness Conflict Risk

The niche (load-path performance) is clear and triggers are mostly load-specific, but "adding a data model, a list/read action" overlaps with a schema/storing-data skill's triggers — a minor overlap risk with a closely related skill rather than the minimal-conflict anchor.