diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5276465..8f4f211 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,13 @@ All notable changes to MetonaSqlark will be documented in this file.
   （返回空而非报错，与其余方法不一致）。统一 ensureOpen
 - **测试盲区** — 快照损坏测试此前篡改未生效（close 后介质不可读），从未真正覆盖损坏路径；
   修复并新增 metaSeq 超前回归测试
+- **批量插入性能悬崖（P1）** — insert 循环内逐行 `lsm.prefetchKeys([key])`，
+  每行 `await drainChain()` 排空后台链：后台 compaction 在链上数秒时每行阻塞数秒 →
+  10 万级插入从 ~5ms/批暴跌到 8~11s/批（kv 后端 10 万行共 353s）。
+  修复：批级预加载本批全部 PK（一次 drainChain），循环内 `lsm.get` 由
+  memtable/flush 产物（自动入缓存）兜底，完整性与批量语义不变。
+  实测：kv 后端 10 万行 **353s → 12.5s**（28 倍），opfs 后端 25s；
+  新增 kv/opfs 双后端 10 万行回归（性能护栏 + 索引完整 + 崩溃恢复）
 
 ### Added
 
diff --git a/src/engine/aria/index.ts b/src/engine/aria/index.ts
index ed0b074..b232b70 100644
--- a/src/engine/aria/index.ts
+++ b/src/engine/aria/index.ts
@@ -537,13 +537,19 @@ export class AriaEngine implements IStorageEngine {
     // v0.3.1: 批量 WAL 写入（组提交），一次 insert 合并为一次落盘
     const walRecords: Omit<WALRecord, 'lsn' | 'checksum'>[] = [];
 
+    // v0.6.1-perf: 批量预加载本批 PK 涉及的 SSTable（一次 drainChain）。
+    // 此前循环内逐行 prefetchKeys —— 每行 await drainChain 排空后台链，
+    // 后台 compaction 在链上数秒时每行阻塞数秒 → 大数据量插入性能悬崖
+    // （10 万行 kv 后端从 5ms/批暴跌到 8~11s/批）。批内新数据在 memtable
+    // 或 flush 产物（自动入缓存），循环内 lsm.get 始终完整。
+    await this.lsm.prefetchKeys(rows.map((r) => `${tableName}:${String(r[pkCol])}`));
+
     for (const row of rows) {
       const validated = this.validateRow(schema, row);
       const pkValue = String(validated[pkCol]);
       const key = `${tableName}:${pkValue}`;
 
       // Check duplicate in LSM + transaction snapshot
-      await this.lsm.prefetchKeys([key]);
       const existing = this.currentTxnId
         ? (this.txnSnapshot?.get(key) ?? this.lsm.get(key))
         : this.lsm.get(key);
diff --git a/tests/engine/aria-cache.test.ts b/tests/engine/aria-cache.test.ts
index 4f8d018..00f8481 100644
--- a/tests/engine/aria-cache.test.ts
+++ b/tests/engine/aria-cache.test.ts
@@ -45,10 +45,14 @@ describe('AriaEngine SSTable 缓存内存上限', () => {
 
     await engine.insert('users', makeRows(300));
     const lsm = (engine as any).lsm as {
+      flush(): Promise<void>;
       getCacheSize(): number;
       getCacheLimit(): number;
       getStats(): { sstableCount: number };
     };
+    // v0.6.1-perf: insert 不再隐式排空后台链（逐行 prefetchKeys 已移除），
+    // 显式等待后台 flush 完成后再断言 SSTable 产物
+    await lsm.flush();
     const stats = lsm.getStats();
     // 300 行 / 2KB 阈值 → 应产生多个 SSTable
     expect(stats.sstableCount).toBeGreaterThan(1);
diff --git a/tests/engine/aria-prod-load.test.ts b/tests/engine/aria-prod-load.test.ts
index a556c8c..5ff176d 100644
--- a/tests/engine/aria-prod-load.test.ts
+++ b/tests/engine/aria-prod-load.test.ts
@@ -290,4 +290,83 @@ describe('AriaEngine — 生产负载验证', () => {
     expect(await engine2.find('big', { table: 'big', where: { tag: 't3' } })).toHaveLength(5000);
     await engine2.close();
   }, 180000);
+
+  it('10 万行 kv 后端（含索引）：完整查询 + 崩溃恢复（v0.6.1-perf 回归）', async () => {
+    const dbName = uniqueDB();
+    const engine = new AriaEngine({
+      storageBackend: 'kv',
+      memtableSizeThreshold: 512 * 1024,
+      checkpointInterval: 30000,
+      walSyncMode: 'full',
+    });
+    await engine.open(dbName, 1);
+    await engine.createTable(SCHEMA());
+
+    const TOTAL = 100000;
+    const t0 = Date.now();
+    for (let batch = 0; batch < TOTAL / 1000; batch++) {
+      const rows = [] as Record<string, unknown>[];
+      for (let i = 0; i < 1000; i++) {
+        const idx = batch * 1000 + i;
+        rows.push({ id: `k${idx}`, val: idx, tag: `t${idx % 10}`, name: `User${idx}` });
+      }
+      await engine.insert('big', rows);
+    }
+    const insertMs = Date.now() - t0;
+    // 性能护栏：修复前 353s（batch 32 起每批 8~11s 性能悬崖），修复后 <30s
+    console.log(`10万行 kv 插入耗时: ${insertMs}ms`);
+    expect(insertMs).toBeLessThan(60000);
+    expect(await engine.count('big')).toBe(TOTAL);
+
+    // 全部 10 个 tag 索引查询完整
+    for (let t = 0; t < 10; t++) {
+      const viaIdx = await engine.find('big', { table: 'big', where: { tag: `t${t}` } });
+      expect(viaIdx.length).toBe(10000);
+    }
+
+    // 崩溃恢复
+    await (engine as any).backend.close();
+    (engine as any).opened = false;
+    const engine2 = new AriaEngine({
+      storageBackend: 'kv',
+      memtableSizeThreshold: 512 * 1024,
+      checkpointInterval: 30000,
+      walSyncMode: 'full',
+    });
+    await engine2.open(dbName, 1);
+    expect(await engine2.count('big')).toBe(TOTAL);
+    expect(await engine2.find('big', { table: 'big', where: { tag: 't7' } })).toHaveLength(10000);
+    await engine2.close();
+  }, 180000);
+
+  it('10 万行 opfs 后端（含索引）：完整查询（v0.6.1-perf 回归）', async () => {
+    const engine = new AriaEngine({
+      storageBackend: 'opfs',
+      memtableSizeThreshold: 512 * 1024,
+      checkpointInterval: 30000,
+      walSyncMode: 'full',
+    });
+    await engine.open(uniqueDB(), 1);
+    await engine.createTable(SCHEMA());
+
+    const TOTAL = 100000;
+    const t0 = Date.now();
+    for (let batch = 0; batch < TOTAL / 1000; batch++) {
+      const rows = [] as Record<string, unknown>[];
+      for (let i = 0; i < 1000; i++) {
+        const idx = batch * 1000 + i;
+        rows.push({ id: `k${idx}`, val: idx, tag: `t${idx % 10}`, name: `User${idx}` });
+      }
+      await engine.insert('big', rows);
+    }
+    const insertMs = Date.now() - t0;
+    console.log(`10万行 opfs 插入耗时: ${insertMs}ms`);
+    expect(insertMs).toBeLessThan(90000);
+    expect(await engine.count('big')).toBe(TOTAL);
+    for (let t = 0; t < 10; t++) {
+      const viaIdx = await engine.find('big', { table: 'big', where: { tag: `t${t}` } });
+      expect(viaIdx.length).toBe(10000);
+    }
+    await engine.close();
+  }, 180000);
 });