diff --git a/loop/plan.md b/loop/plan.md
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@@ -139,15 +139,15 @@
 
 ## M18: Performance
 
-- [ ] **M18.1** — Bundle analysis & splitting (`vite-bundle-visualizer`, identify eager loads, add route chunks)
-- [ ] **M18.2** — Image lazy loading with blur-up (`loading="lazy"`, 16×16 base64 placeholder, CSS transition)
-- [ ] **M18.3** — Request deduplication (`useFetch()` composable, in-flight Promise sharing, AbortController)
-- [ ] **M18.4** — Web Worker for heavy tasks (`heavy.worker.ts` via Comlink, contentExtraction + crypto)
-- [ ] **M18.5** — Prefetch on hover (mouseenter/touch-hold, pre-fetch detail data, 5-min short-lived cache)
-- [ ] **M18.6** — Memory leak audit (`onUnmounted` cleanup for all intervals/listeners/WebSockets/observers)
-- [ ] **M18.7** — Background sync queue (queue failed IDB saves, retry on `visibilitychange`, warn badge)
-- [ ] **M18.8** — OPFS storage backend (SQLite WASM via `@sqlite.org/sqlite-wasm`, `VITE_STORAGE=opfs` flag)
-- [ ] **TEST:M18** — Run `pnpm test`, `pnpm build`, verify gzipped bundle < 250 KB. Fix if over budget.
+- [x] **M18.1** — Bundle analysis & splitting (`vite-bundle-visualizer`, identify eager loads, add route chunks)
+- [x] **M18.2** — Image lazy loading with blur-up (`loading="lazy"`, 16×16 base64 placeholder, CSS transition)
+- [x] **M18.3** — Request deduplication (`useFetch()` composable, in-flight Promise sharing, AbortController)
+- [x] **M18.4** — Web Worker for heavy tasks (`heavy.worker.ts` via Comlink, contentExtraction + crypto)
+- [x] **M18.5** — Prefetch on hover (mouseenter/touch-hold, pre-fetch detail data, 5-min short-lived cache)
+- [x] **M18.6** — Memory leak audit (`onUnmounted` cleanup for all intervals/listeners/WebSockets/observers)
+- [x] **M18.7** — Background sync queue (queue failed IDB saves, retry on `visibilitychange`, warn badge)
+- [x] **M18.8** — OPFS storage backend (SQLite WASM via `@sqlite.org/sqlite-wasm`, `VITE_STORAGE=opfs` flag)
+- [x] **TEST:M18** — Run `pnpm test`, `pnpm build`, verify gzipped bundle < 250 KB. Fix if over budget.
 
 ## M19: Developer Experience & Quality