diff --git a/app/Core/Helper.php b/app/Core/Helper.php
index 23f2945..9e2437d 100644
--- a/app/Core/Helper.php
+++ b/app/Core/Helper.php
@@ -167,6 +167,19 @@ if (!function_exists('site_url')) {
         if (!subsys_user('psi')) return 0;
         $uid = (int) ($_SESSION['admin_uid'] ?? 0);
         if ($uid <= 0) return 0;
+        // V0.9.3：MySQL 下改用 COUNT + JSON_CONTAINS 聚合，避免每个后台页都 SELECT * 全表拉回再循环计数。
+        // 语义与旧逻辑一致：统计「当前用户不在 read_by 已读列表」的事件数。
+        if (\Core\Db::driver() === 'mysql') {
+            try {
+                return (int) \Core\Db::query(
+                    "SELECT COUNT(*) FROM psi_events WHERE JSON_CONTAINS(COALESCE(read_by,'[]'), CAST(? AS JSON)) = 0",
+                    [$uid]
+                )->fetchColumn();
+            } catch (\Throwable $e) {
+                // 极端情况（如 read_by 含非法 JSON）回退旧逻辑，保证铃铛数字不报错
+            }
+        }
+        // 文件模式 / MySQL 兜底：无 JSON 函数或异常，保留全表循环（数据量小，可接受）
         try {
             $events = (new \App\Models\PSI\Event())->all();
         } catch (\Throwable $e) {
diff --git a/app/Core/Model.php b/app/Core/Model.php
index c263041..deaa69d 100644
--- a/app/Core/Model.php
+++ b/app/Core/Model.php
@@ -11,6 +11,28 @@ class Model
     protected $pk = 'id';
     protected $orderBy = 'id';
 
+    /* ---------- 请求内缓存（同一请求内重复读取同一查询只走一次 DB/文件） ---------- */
+    private static $reqCache = [];
+
+    private function cacheKey(string $method, ...$args): string
+    {
+        return $this->table . '|' . $method . '|' . md5(serialize($args));
+    }
+    /** 读取缓存；未命中返回 null（用 array_key_exists 区分「未缓存」与「缓存了空数组」） */
+    private function cacheGet(string $k)
+    {
+        return array_key_exists($k, self::$reqCache) ? self::$reqCache[$k] : null;
+    }
+    private function cachePut(string $k, $v): void
+    {
+        self::$reqCache[$k] = $v;
+    }
+    /** 任意写操作后清空请求内缓存，避免同请求内读到脏数据（CMS 读多写少，刷新成本可忽略） */
+    private function cacheFlush(): void
+    {
+        self::$reqCache = [];
+    }
+
     /* ---------- 文件模式 ---------- */
     private function file(): string
     {
@@ -71,10 +93,16 @@ class Model
     /* ---------- 通用 CRUD ---------- */
     public function all(): array
     {
+        $k = $this->cacheKey('all');
+        $hit = $this->cacheGet($k);
+        if ($hit !== null) return $hit;
         if (Db::driver() === 'mysql') {
-            return Db::query("SELECT * FROM `{$this->table}` ORDER BY `{$this->orderBy}` ASC")->fetchAll();
+            $rows = Db::query("SELECT * FROM `{$this->table}` ORDER BY `{$this->orderBy}` ASC")->fetchAll();
+        } else {
+            $rows = $this->read(); $this->sort($rows);
         }
-        $rows = $this->read(); $this->sort($rows); return $rows;
+        $this->cachePut($k, $rows);
+        return $rows;
     }
 
     public function find($id)
@@ -106,6 +134,7 @@ class Model
 
     public function insert(array $data)
     {
+        $this->cacheFlush();
         if (Db::driver() === 'mysql') {
             $cols = array_keys($data);
             $sql = "INSERT INTO `{$this->table}` (`" . implode('`,`', $cols) . "`) VALUES (" . implode(',', array_fill(0, count($cols), '?')) . ")";
@@ -121,6 +150,7 @@ class Model
 
     public function update($id, array $data): void
     {
+        $this->cacheFlush();
         if (Db::driver() === 'mysql') {
             $cols = array_keys($data);
             $sql = "UPDATE `{$this->table}` SET `" . implode('`=?,`', $cols) . "`=? WHERE `{$this->pk}`=?";
@@ -136,6 +166,7 @@ class Model
 
     public function delete($id): void
     {
+        $this->cacheFlush();
         if (Db::driver() === 'mysql') {
             Db::query("DELETE FROM `{$this->table}` WHERE `{$this->pk}`=?", [$id]);
             return;
@@ -147,6 +178,7 @@ class Model
     /** 按任意列批量删除（用于主从表级联删除从表） */
     public function deleteRaw(string $col, $val): void
     {
+        $this->cacheFlush();
         if (Db::driver() === 'mysql') {
             Db::query("DELETE FROM `{$this->table}` WHERE `{$col}`=?", [$val]);
             return;
@@ -155,8 +187,42 @@ class Model
         $this->write(array_values($rows));
     }
 
-    public function count(): int
+    /**
+     * 计数：MySQL 下走 COUNT(*) 聚合（避免 SELECT * 全表拉回再 count）；
+     * 可选按某列过滤。文件模式下回退为本地计数。
+     * @param string|null $col 过滤列（null 表示全表计数）
+     * @param mixed       $val 过滤值
+     */
+    public function count(string $col = null, $val = null): int
     {
-        return count($this->all());
+        if (Db::driver() === 'mysql') {
+            if ($col === null) {
+                return (int) Db::query("SELECT COUNT(*) FROM `{$this->table}`")->fetchColumn();
+            }
+            return (int) Db::query("SELECT COUNT(*) FROM `{$this->table}` WHERE `{$col}`=?", [$val])->fetchColumn();
+        }
+        $rows = $this->all();
+        if ($col === null) return count($rows);
+        $n = 0;
+        foreach ($rows as $r) {
+            if (($r[$col] ?? null) == $val) $n++;
+        }
+        return $n;
+    }
+
+    /**
+     * 取某列等于 $val 的前 $limit 条。
+     * MySQL 下带 LIMIT（索引友好）；文件模式用 whereAll + array_slice 兜底。
+     * 用于首页精选 / 列表分页等高频只读场景。
+     */
+    public function whereLimit(string $col, $val, int $limit): array
+    {
+        if (Db::driver() === 'mysql') {
+            return Db::query(
+                "SELECT * FROM `{$this->table}` WHERE `{$col}`=? ORDER BY `{$this->orderBy}` ASC LIMIT ?",
+                [$val, $limit]
+            )->fetchAll();
+        }
+        return array_slice($this->whereAll($col, $val), 0, $limit);
     }
 }
diff --git a/app/Models/Product.php b/app/Models/Product.php
index 8c6c4ca..0dc34d1 100644
--- a/app/Models/Product.php
+++ b/app/Models/Product.php
@@ -14,7 +14,9 @@ class Product extends Model
     }
     public function featured(int $limit = 6): array
     {
-        return array_slice(array_filter($this->all(), fn($p) => ($p['status'] ?? 1) == 1), 0, $limit);
+        // V0.9.1：改用 whereLimit('status',1,$limit)，MySQL 下走带 LIMIT 的索引查询，
+        // 不再 SELECT * 全表拉回再 array_filter（原写法每次请求都全表扫描）。
+        return $this->whereLimit('status', 1, $limit);
     }
     public function specsArray($p): array
     {
diff --git a/install/schema.sql b/install/schema.sql
index 214599e..7776737 100644
--- a/install/schema.sql
+++ b/install/schema.sql
@@ -10,7 +10,8 @@ CREATE TABLE IF NOT EXISTS `categories` (
   `sort_order` INT DEFAULT 0,
   `status` TINYINT DEFAULT 1,
   `layout` TEXT,
-  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed'
+  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed',
+  KEY idx_categories_slug (slug)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `products` (
@@ -29,7 +30,10 @@ CREATE TABLE IF NOT EXISTS `products` (
   `status` TINYINT DEFAULT 1,
   `created_at` VARCHAR(20) DEFAULT '',
   `layout` TEXT,
-  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed'
+  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed',
+  KEY idx_products_category_id (category_id),
+  KEY idx_products_slug (slug),
+  KEY idx_products_status (status)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `news` (
@@ -44,7 +48,9 @@ CREATE TABLE IF NOT EXISTS `news` (
   `status` TINYINT DEFAULT 1,
   `views` INT DEFAULT 0,
   `layout` TEXT,
-  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed'
+  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed',
+  KEY idx_news_slug (slug),
+  KEY idx_news_status (status)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `cases` (
@@ -61,7 +67,9 @@ CREATE TABLE IF NOT EXISTS `cases` (
   `status` TINYINT DEFAULT 1,
   `views` INT DEFAULT 0,
   `layout` TEXT,
-  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed'
+  `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed',
+  KEY idx_cases_slug (slug),
+  KEY idx_cases_status (status)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `pages` (
@@ -71,7 +79,8 @@ CREATE TABLE IF NOT EXISTS `pages` (
   `content` TEXT,
   `layout` TEXT,
   `mode` VARCHAR(16) NOT NULL DEFAULT 'fixed',
-  `updated_at` VARCHAR(20) DEFAULT ''
+  `updated_at` VARCHAR(20) DEFAULT '',
+  KEY idx_pages_slug (slug)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `banners` (
@@ -81,7 +90,9 @@ CREATE TABLE IF NOT EXISTS `banners` (
   `image` VARCHAR(255) DEFAULT '',
   `link` VARCHAR(255) DEFAULT '',
   `sort_order` INT DEFAULT 0,
-  `status` TINYINT DEFAULT 1
+  `status` TINYINT DEFAULT 1,
+  KEY idx_banners_status (status),
+  KEY idx_banners_sort (sort_order)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `admin_users` (
@@ -95,7 +106,8 @@ CREATE TABLE IF NOT EXISTS `admin_users` (
   `crm_perms` TEXT,
   `psi_perms` TEXT,
   `status` TINYINT DEFAULT 1,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_admin_users_role (role)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 /* ===================== CRM 客户管理系统 ===================== */
@@ -117,7 +129,8 @@ CREATE TABLE IF NOT EXISTS `crm_customers` (
   `status` VARCHAR(20) DEFAULT 'lead',
   `remark` TEXT,
   `owner` VARCHAR(60) DEFAULT '',
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_customers_status (status)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `crm_contacts` (
@@ -130,7 +143,8 @@ CREATE TABLE IF NOT EXISTS `crm_contacts` (
   `wechat` VARCHAR(60) DEFAULT '',
   `is_primary` TINYINT DEFAULT 0,
   `remark` TEXT,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_contacts_customer_id (customer_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `crm_leads` (
@@ -144,7 +158,8 @@ CREATE TABLE IF NOT EXISTS `crm_leads` (
   `probability` TINYINT DEFAULT 0,
   `owner` VARCHAR(60) DEFAULT '',
   `remark` TEXT,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_leads_customer_id (customer_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `crm_followups` (
@@ -156,7 +171,9 @@ CREATE TABLE IF NOT EXISTS `crm_followups` (
   `way` VARCHAR(20) DEFAULT '',
   `result` VARCHAR(60) DEFAULT '',
   `owner` VARCHAR(60) DEFAULT '',
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_followups_customer_id (customer_id),
+  KEY idx_followups_lead_id (lead_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 /* ===================== 进销存 PSI 系统 ===================== */
@@ -176,7 +193,9 @@ CREATE TABLE IF NOT EXISTS `psi_materials` (
   `price` DECIMAL(10,2) DEFAULT 0,
   `supplier_id` INT DEFAULT 0,
   `remark` TEXT,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_materials_supplier_id (supplier_id),
+  KEY idx_materials_code (code)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `psi_products` (
@@ -195,7 +214,8 @@ CREATE TABLE IF NOT EXISTS `psi_products` (
   `cost` DECIMAL(10,2) DEFAULT 0,
   `price` DECIMAL(10,2) DEFAULT 0,
   `remark` TEXT,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_psi_products_code (code)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `psi_suppliers` (
@@ -225,7 +245,9 @@ CREATE TABLE IF NOT EXISTS `psi_purchases` (
   `batch_no` VARCHAR(40) DEFAULT '',
   `expected_at` VARCHAR(20) DEFAULT '',
   `remark` TEXT,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_purchases_supplier_id (supplier_id),
+  KEY idx_purchases_order_no (order_no)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `psi_sales` (
@@ -241,7 +263,8 @@ CREATE TABLE IF NOT EXISTS `psi_sales` (
   `region` VARCHAR(40) DEFAULT '',
   `batch_no` VARCHAR(40) DEFAULT '',
   `remark` TEXT,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_sales_order_no (order_no)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `psi_stock_moves` (
@@ -253,14 +276,16 @@ CREATE TABLE IF NOT EXISTS `psi_stock_moves` (
   `ref_no` VARCHAR(40) DEFAULT '',
   `batch_no` VARCHAR(40) DEFAULT '',
   `remark` TEXT,
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_stock_moves_item (item_type, item_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `settings` (
   `id` INT AUTO_INCREMENT PRIMARY KEY,
   `skey` VARCHAR(120) NOT NULL,
   `sval` TEXT,
-  `sgroup` VARCHAR(40) DEFAULT 'site'
+  `sgroup` VARCHAR(40) DEFAULT 'site',
+  KEY idx_settings_sgroup (sgroup)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `orders` (
@@ -277,7 +302,10 @@ CREATE TABLE IF NOT EXISTS `orders` (
   `status` VARCHAR(20) DEFAULT 'pending',
   `gateway_trade_no` VARCHAR(120) DEFAULT '',
   `paid_at` VARCHAR(20) DEFAULT '',
-  `created_at` VARCHAR(20) DEFAULT ''
+  `created_at` VARCHAR(20) DEFAULT '',
+  KEY idx_orders_order_no (order_no),
+  KEY idx_orders_status (status),
+  KEY idx_orders_product_id (product_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `payments` (
@@ -289,7 +317,9 @@ CREATE TABLE IF NOT EXISTS `payments` (
   `trade_no` VARCHAR(120) DEFAULT '',
   `status` VARCHAR(20) DEFAULT '',
   `created_at` VARCHAR(20) DEFAULT '',
-  `paid_at` VARCHAR(20) DEFAULT ''
+  `paid_at` VARCHAR(20) DEFAULT '',
+  KEY idx_payments_order_id (order_id),
+  KEY idx_payments_order_no (order_no)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 CREATE TABLE IF NOT EXISTS `psi_events` (
@@ -304,5 +334,7 @@ CREATE TABLE IF NOT EXISTS `psi_events` (
   `recipients` TEXT,
   `channels` VARCHAR(255) NOT NULL DEFAULT '["inapp"]',
   `read_by` TEXT,
-  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  KEY idx_events_sys (sys),
+  KEY idx_events_level (level)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/install/upgrades/009_perf_indexes.sql b/install/upgrades/009_perf_indexes.sql
new file mode 100644
index 0000000..fac9887
--- /dev/null
+++ b/install/upgrades/009_perf_indexes.sql
@@ -0,0 +1,55 @@
+-- V0.9.2 性能优化：为高频查询列补齐二级索引（MySQL 5.7 兼容）
+-- 通过存储过程判断索引是否已存在，重复执行不会报错。
+-- 部署方式：放入 install/upgrades/ 后，后台「数据库升级」一键应用（仅超级管理员）。
+-- 升级记录会写入 db_upgrades，内容不变不会重复执行。
+
+DROP PROCEDURE IF EXISTS _perf_add_idx;
+DELIMITER $$
+CREATE PROCEDURE _perf_add_idx(IN p_table VARCHAR(64), IN p_name VARCHAR(64), IN p_cols VARCHAR(255))
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.STATISTICS
+    WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = p_table AND INDEX_NAME = p_name
+  ) THEN
+    SET @_perf_sql = CONCAT('ALTER TABLE `', p_table, '` ADD INDEX `', p_name, '` (', p_cols, ')');
+    PREPARE _perf_stmt FROM @_perf_sql;
+    EXECUTE _perf_stmt;
+    DEALLOCATE PREPARE _perf_stmt;
+  END IF;
+END$$
+DELIMITER ;
+
+CALL _perf_add_idx('categories','idx_categories_slug','`slug`');
+CALL _perf_add_idx('products','idx_products_category_id','`category_id`');
+CALL _perf_add_idx('products','idx_products_slug','`slug`');
+CALL _perf_add_idx('products','idx_products_status','`status`');
+CALL _perf_add_idx('news','idx_news_slug','`slug`');
+CALL _perf_add_idx('news','idx_news_status','`status`');
+CALL _perf_add_idx('cases','idx_cases_slug','`slug`');
+CALL _perf_add_idx('cases','idx_cases_status','`status`');
+CALL _perf_add_idx('pages','idx_pages_slug','`slug`');
+CALL _perf_add_idx('banners','idx_banners_status','`status`');
+CALL _perf_add_idx('banners','idx_banners_sort','`sort_order`');
+CALL _perf_add_idx('admin_users','idx_admin_users_role','`role`');
+CALL _perf_add_idx('orders','idx_orders_order_no','`order_no`');
+CALL _perf_add_idx('orders','idx_orders_status','`status`');
+CALL _perf_add_idx('orders','idx_orders_product_id','`product_id`');
+CALL _perf_add_idx('payments','idx_payments_order_id','`order_id`');
+CALL _perf_add_idx('payments','idx_payments_order_no','`order_no`');
+CALL _perf_add_idx('crm_customers','idx_customers_status','`status`');
+CALL _perf_add_idx('crm_contacts','idx_contacts_customer_id','`customer_id`');
+CALL _perf_add_idx('crm_leads','idx_leads_customer_id','`customer_id`');
+CALL _perf_add_idx('crm_followups','idx_followups_customer_id','`customer_id`');
+CALL _perf_add_idx('crm_followups','idx_followups_lead_id','`lead_id`');
+CALL _perf_add_idx('psi_materials','idx_materials_supplier_id','`supplier_id`');
+CALL _perf_add_idx('psi_materials','idx_materials_code','`code`');
+CALL _perf_add_idx('psi_products','idx_psi_products_code','`code`');
+CALL _perf_add_idx('psi_purchases','idx_purchases_supplier_id','`supplier_id`');
+CALL _perf_add_idx('psi_purchases','idx_purchases_order_no','`order_no`');
+CALL _perf_add_idx('psi_sales','idx_sales_order_no','`order_no`');
+CALL _perf_add_idx('psi_stock_moves','idx_stock_moves_item','`item_type`,`item_id`');
+CALL _perf_add_idx('settings','idx_settings_sgroup','`sgroup`');
+CALL _perf_add_idx('psi_events','idx_events_sys','`sys`');
+CALL _perf_add_idx('psi_events','idx_events_level','`level`');
+
+DROP PROCEDURE IF EXISTS _perf_add_idx;