diff --git a/core/components/minishop3/src/Services/GridConfigService.php b/core/components/minishop3/src/Services/GridConfigService.php
index e1d913d8..014d00ea 100644
--- a/core/components/minishop3/src/Services/GridConfigService.php
+++ b/core/components/minishop3/src/Services/GridConfigService.php
@@ -14,6 +14,22 @@ class GridConfigService
     /** @var modX */
     protected $modx;
 
+    /**
+     * Request-scoped memo for getGridConfig(): gridKey:includeHidden → column config.
+     *
+     * This cache is safe only because GridConfigService is registered in the
+     * MODX DI container as a request-scoped singleton (see ServiceRegistry):
+     * one instance per request, never shared across requests. The memo must
+     * never be persisted to a long-lived process cache or serialized — it
+     * holds no TTL and would leak stale data across requests. Mutation
+     * methods (saveGridConfig, addField, updateField, deleteField) invalidate
+     * the affected gridKey entries via invalidateGridConfigCache() so the next
+     * read re-loads from the database.
+     *
+     * @var array<string, array<int, array<string, mixed>>>
+     */
+    private array $gridConfigCache = [];
+
     /**
      * @param modX $modx
      */
@@ -29,6 +45,22 @@ public function __construct(modX $modx)
      * @return array
      */
     public function getGridConfig(string $gridKey, bool $includeHidden = false): array
+    {
+        $cacheKey = $this->gridConfigCacheKey($gridKey, $includeHidden);
+        if (array_key_exists($cacheKey, $this->gridConfigCache)) {
+            return $this->gridConfigCache[$cacheKey];
+        }
+
+        $fields = $this->loadGridConfig($gridKey, $includeHidden);
+        $this->gridConfigCache[$cacheKey] = $fields;
+
+        return $fields;
+    }
+
+    /**
+     * @return list<array<string, mixed>>
+     */
+    private function loadGridConfig(string $gridKey, bool $includeHidden): array
     {
         $query = $this->modx->newQuery(msGridField::class);
         $where = ['grid_key' => $gridKey];
@@ -74,6 +106,27 @@ public function getGridConfig(string $gridKey, bool $includeHidden = false): arr
         return $fields;
     }
 
+    private function gridConfigCacheKey(string $gridKey, bool $includeHidden): string
+    {
+        return $gridKey . ':' . ($includeHidden ? '1' : '0');
+    }
+
+    /**
+     * Call at the start of any msGridField mutation so request-scoped cache stays consistent.
+     */
+    private function beginGridMutation(string $gridKey): void
+    {
+        $this->invalidateGridConfigCache($gridKey);
+    }
+
+    private function invalidateGridConfigCache(string $gridKey): void
+    {
+        unset(
+            $this->gridConfigCache[$this->gridConfigCacheKey($gridKey, false)],
+            $this->gridConfigCache[$this->gridConfigCacheKey($gridKey, true)]
+        );
+    }
+
     /**
      * Get label considering lexicon_key
      *
@@ -112,6 +165,8 @@ protected function resolveLabel(msGridField $field): string
      */
     public function saveGridConfig(string $gridKey, array $fields): bool
     {
+        $this->beginGridMutation($gridKey);
+
         try {
             // Get list of field names to keep
             $fieldNamesToKeep = [];
@@ -253,6 +308,8 @@ public function saveGridConfig(string $gridKey, array $fields): bool
      */
     public function deleteField(string $gridKey, string $fieldName): array
     {
+        $this->beginGridMutation($gridKey);
+
         try {
             $field = $this->modx->getObject(msGridField::class, [
                 'grid_key' => $gridKey,
@@ -308,6 +365,8 @@ public function deleteField(string $gridKey, string $fieldName): array
      */
     public function addField(string $gridKey, array $data): array
     {
+        $this->beginGridMutation($gridKey);
+
         try {
             // Basic validation
             if (empty($data['field_name'])) {
@@ -450,6 +509,8 @@ public function addField(string $gridKey, array $data): array
      */
     public function updateField(string $gridKey, string $fieldName, array $data): array
     {
+        $this->beginGridMutation($gridKey);
+
         try {
             // Find existing field
             $field = $this->modx->getObject(msGridField::class, [
diff --git a/core/components/minishop3/tests/Unit/Services/GridConfigServiceMemoTest.php b/core/components/minishop3/tests/Unit/Services/GridConfigServiceMemoTest.php
new file mode 100644
index 00000000..73345b16
--- /dev/null
+++ b/core/components/minishop3/tests/Unit/Services/GridConfigServiceMemoTest.php
@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop3\Tests\Unit\Services;
+
+require_once __DIR__ . '/../../stubs/ModxStub.php';
+require_once __DIR__ . '/../../stubs/GridConfigQueryStub.php';
+require_once __DIR__ . '/../../stubs/GridConfigModxStub.php';
+
+use MiniShop3\Services\GridConfigService;
+use MiniShop3\Tests\Stubs\GridConfigModxStub;
+use PHPUnit\Framework\TestCase;
+
+final class GridConfigServiceMemoTest extends TestCase
+{
+    public function testGetGridConfigMemoizesWithinSameInstance(): void
+    {
+        $modx = new GridConfigModxStub();
+        $service = new GridConfigService($modx);
+
+        $first = $service->getGridConfig('orders', true);
+        $second = $service->getGridConfig('orders', true);
+
+        self::assertSame($first, $second);
+        self::assertSame(1, $modx->getCollectionCalls);
+        self::assertSame([], $first);
+    }
+
+    public function testIncludeHiddenUsesSeparateCacheEntry(): void
+    {
+        $modx = new GridConfigModxStub();
+        $service = new GridConfigService($modx);
+
+        $service->getGridConfig('orders', false);
+        $service->getGridConfig('orders', true);
+
+        self::assertSame(2, $modx->getCollectionCalls);
+    }
+
+    public function testSaveGridConfigInvalidatesMemoForSameRequest(): void
+    {
+        $modx = new GridConfigModxStub();
+        $service = new GridConfigService($modx);
+
+        $service->getGridConfig('orders', true);
+        $service->saveGridConfig('orders', []);
+        $service->getGridConfig('orders', true);
+
+        // 1st read + saveGridConfig delete scan + 2nd read after cache invalidation
+        self::assertSame(3, $modx->getCollectionCalls);
+    }
+}
diff --git a/core/components/minishop3/tests/stubs/GridConfigModxStub.php b/core/components/minishop3/tests/stubs/GridConfigModxStub.php
new file mode 100644
index 00000000..498cca90
--- /dev/null
+++ b/core/components/minishop3/tests/stubs/GridConfigModxStub.php
@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop3\Tests\Stubs;
+
+use MODX\Revolution\modX;
+
+/**
+ * modX stub that counts msGridField collection loads for GridConfigService tests.
+ */
+final class GridConfigModxStub extends modX
+{
+    public int $getCollectionCalls = 0;
+
+    /** @var list<object> */
+    public array $gridFields = [];
+
+    /** @var object */
+    public object $lexicon;
+
+    public function __construct()
+    {
+        parent::__construct();
+        $this->lexicon = new class {
+            public function load(string $topic): void
+            {
+            }
+
+            public function __invoke(string $key): string
+            {
+                return $key;
+            }
+        };
+    }
+
+    public function newQuery($class = ''): GridConfigQueryStub
+    {
+        return new GridConfigQueryStub();
+    }
+
+    public function getCollection($className, $criteria = null): array
+    {
+        $this->getCollectionCalls++;
+
+        return $this->gridFields;
+    }
+
+    public function getObject($className, $criteria = null, $cacheFlag = true): ?object
+    {
+        return null;
+    }
+}
diff --git a/core/components/minishop3/tests/stubs/GridConfigQueryStub.php b/core/components/minishop3/tests/stubs/GridConfigQueryStub.php
new file mode 100644
index 00000000..0d16ea35
--- /dev/null
+++ b/core/components/minishop3/tests/stubs/GridConfigQueryStub.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop3\Tests\Stubs;
+
+/**
+ * Fluent query stub — GridConfigService only chains where/sortby before getCollection.
+ */
+final class GridConfigQueryStub
+{
+    public function where(array $criteria): self
+    {
+        return $this;
+    }
+
+    public function sortby(string $column, string $direction = 'ASC'): self
+    {
+        return $this;
+    }
+
+    public function limit(int $limit): self
+    {
+        return $this;
+    }
+}