diff --git a/src/DbMapper.php b/src/DbMapper.php
index 6ba3557..9172917 100644
--- a/src/DbMapper.php
+++ b/src/DbMapper.php
@@ -16,9 +16,10 @@
 
 namespace danog\AsyncOrm;
 
+use Amp\ForbidCloning;
+use Amp\ForbidSerialization;
 use Amp\Sync\LocalKeyedMutex;
 use AssertionError;
-use WeakMap;
 
 /**
  * Async DB mapper.
@@ -28,9 +29,12 @@ use WeakMap;
  */
 final readonly class DbMapper
 {
+    use ForbidCloning;
+    use ForbidSerialization;
+
+    /** @var DbArray<string|int, T> */
     private readonly DbArray $arr;
     private readonly LocalKeyedMutex $mutex;
-    private readonly WeakMap $inited;
     /**
      * Constructor.
      *
@@ -43,7 +47,7 @@ final readonly class DbMapper
      * @param ?self $previous Previous instance, used for migrations.
      */
     public function __construct(
-        private readonly string $table,
+        public readonly string $table,
         private readonly string $class,
         private readonly Settings $settings,
         KeyType $keyType,
@@ -54,7 +58,6 @@ final readonly class DbMapper
         if (\is_subclass_of($class, DbArray::class)) {
             throw new AssertionError("$class must extend DbArray!");
         }
-        $this->inited = new WeakMap;
         $this->mutex = new LocalKeyedMutex;
         $config = new FieldConfig(
             $table,
@@ -65,12 +68,6 @@ final readonly class DbMapper
             $optimizeIfWastedGtMb
         );
         $this->arr = $config->get($previous?->arr);
-        if ($previous !== null) {
-            foreach ($previous->inited as $key => $obj) {
-                $obj->__initDb($this->table, $this->settings);
-                $this->inited[$key] = $obj;
-            }
-        }
     }
 
     /**
@@ -82,13 +79,12 @@ final readonly class DbMapper
     {
         $lock = $this->mutex->acquire((string) $key);
         try {
-            if (isset($this->inited[$key])) {
+            if (isset($this->arr[$key])) {
                 throw new AssertionError("An object under the key $key already exists!");
             }
             $obj = new $this->class;
             $obj->__initDb($this->table, $this->settings);
             $this->arr[$key] = $obj;
-            $this->inited[$key] = $obj;
             return $obj;
         } finally {
             $lock->release();
@@ -106,13 +102,12 @@ final readonly class DbMapper
     {
         $lock = $this->mutex->acquire((string) $key);
         try {
-            if (isset($this->inited[$key])) {
-                return $this->inited[$key];
-            }
             $obj = $this->arr[$key];
             if ($obj !== null) {
-                $obj->__initDb($this->table, $this->settings);
-                $this->inited[$key] = $obj;
+                $obj->__initDb(
+                    $this->table,
+                    $this->settings,
+                );
             }
             return $obj;
         } finally {
diff --git a/src/DbObject.php b/src/DbObject.php
index 0821145..2f1b5b9 100644
--- a/src/DbObject.php
+++ b/src/DbObject.php
@@ -19,6 +19,7 @@
 namespace danog\AsyncOrm;
 
 use danog\AsyncOrm\Annotations\OrmMappedArray;
+use danog\AsyncOrm\Internal\Driver\CachedArray;
 use danog\AsyncOrm\Settings\DriverSettings;
 use danog\AsyncOrm\Settings\Mysql;
 use ReflectionClass;
@@ -28,13 +29,20 @@ use function Amp\Future\await;
 
 abstract class DbObject
 {
+    /** @var list<CachedArray> */
+    private array $properties;
+    private DbArray $mapper;
+    private string|int $key;
+
     /**
      * Initialize database instance.
      *
      * @internal
      */
-    final public function __initDb(string $table, Settings $settings): void
+    final public function initDb(DbArray $mapper, string|int $key, FieldConfig $config): void
     {
+        $this->mapper = $mapper;
+        $this->key = $key;
         $promises = [];
         foreach ((new ReflectionClass(static::class))->getProperties() as $property) {
             $attr = $property->getAttributes(OrmMappedArray::class);
@@ -45,31 +53,43 @@ abstract class DbObject
 
             $ttl = $attr->cacheTtl;
             $optimize = $attr->optimizeIfWastedGtMb;
-            if ($settings instanceof DriverSettings) {
-                $ttl ??= $settings->cacheTtl;
+            if ($config->settings instanceof DriverSettings) {
+                $ttl ??= $config->settings->cacheTtl;
 
-                if ($settings instanceof Mysql) {
-                    $optimize ??= $settings->optimizeIfWastedGtMb;
+                if ($config->settings instanceof Mysql) {
+                    $optimize ??= $config->settings->optimizeIfWastedGtMb;
                 }
             }
 
             $config = new FieldConfig(
-                $table.'_'.$property->getName(),
-                $settings,
+                $config->table.'_'.$property->getName(),
+                $config->settings,
                 $attr->keyType,
                 $attr->valueType,
                 $ttl,
                 $optimize,
             );
 
-            $promises[$property] = async(
-                $config->get(...),
-                $this->{$property} ?? null
-            );
+            $promises[] = async(function () use ($config, $property) {
+                $v = $config->get($property->getValue());
+                $property->setValue($v);
+                if ($v instanceof CachedArray) {
+                    $this->properties []= $v;
+                }
+            });
         }
-        $promises = await($promises);
-        foreach ($promises as $key => $data) {
-            $this->{$key} = $data;
+        await($promises);
+    }
+
+    /**
+     * Save object to database.
+     */
+    public function save(): void
+    {
+        $promises = [async($this->mapper->set(...), $this->key, $this)];
+        foreach ($this->properties as $v) {
+            $promises []= async($v->flushCache(...));
         }
+        await($promises);
     }
 }
diff --git a/src/Internal/Driver/CacheContainer.php b/src/Internal/Containers/CacheContainer.php
similarity index 97%
rename from src/Internal/Driver/CacheContainer.php
rename to src/Internal/Containers/CacheContainer.php
index 1ad4d0d..82b735f 100644
--- a/src/Internal/Driver/CacheContainer.php
+++ b/src/Internal/Containers/CacheContainer.php
@@ -16,7 +16,7 @@
  * @link https://daniil.it/AsyncOrm AsyncOrm documentation
  */
 
-namespace danog\AsyncOrm\Internal\Driver;
+namespace danog\AsyncOrm\Internal\Containers;
 
 use Amp\Sync\LocalMutex;
 use danog\AsyncOrm\DbArray;
@@ -51,8 +51,7 @@ final class CacheContainer
     }
     public function __sleep()
     {
-        $this->flushCache();
-        return ['cache', 'ttl', 'inner'];
+        return ['inner'];
     }
     public function __wakeup(): void
     {
diff --git a/src/Internal/Containers/ObjectContainer.php b/src/Internal/Containers/ObjectContainer.php
new file mode 100644
index 0000000..de0aae2
--- /dev/null
+++ b/src/Internal/Containers/ObjectContainer.php
@@ -0,0 +1,177 @@
+<?php declare(strict_types=1);
+
+/**
+ * This file is part of AsyncOrm.
+ * AsyncOrm is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General private License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ * AsyncOrm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Affero General private License for more details.
+ * You should have received a copy of the GNU General private License along with AsyncOrm.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @author    Alexander Pankratov <alexander@i-c-a.su>
+ * @copyright 2016-2024 Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2024 Alexander Pankratov <alexander@i-c-a.su>
+ * @license   https://opensource.org/licenses/AGPL-3.0 AGPLv3
+ * @link https://daniil.it/AsyncOrm AsyncOrm documentation
+ */
+
+namespace danog\AsyncOrm\Internal\Containers;
+
+use Amp\Sync\LocalMutex;
+use danog\AsyncOrm\DbArray;
+use danog\AsyncOrm\DbObject;
+use danog\AsyncOrm\FieldConfig;
+use Revolt\EventLoop;
+use Traversable;
+
+/** @internal */
+final class ObjectContainer
+{
+    /**
+     * @var array<ObjectReference>
+     */
+    private array $cache = [];
+
+    private int $cacheTtl;
+
+    /**
+     * Cache cleanup watcher ID.
+     */
+    private ?string $cacheCleanupId = null;
+
+    private LocalMutex $mutex;
+
+    public function __construct(
+        /** @var DbArray<array-key, DbObject> */
+        public DbArray $inner,
+        public FieldConfig $config,
+    ) {
+        $this->mutex = new LocalMutex;
+    }
+    public function __sleep()
+    {
+        return ['inner'];
+    }
+    public function __wakeup(): void
+    {
+        $this->mutex = new LocalMutex;
+    }
+
+    public function startCacheCleanupLoop(int $cacheTtl): void
+    {
+        $this->cacheTtl = $cacheTtl;
+        if ($this->cacheCleanupId) {
+            EventLoop::cancel($this->cacheCleanupId);
+        }
+        $this->cacheCleanupId = EventLoop::repeat(
+            \max(1, $this->cacheTtl / 5),
+            fn () => $this->flushCache(),
+        );
+    }
+    public function stopCacheCleanupLoop(): void
+    {
+        if ($this->cacheCleanupId) {
+            EventLoop::cancel($this->cacheCleanupId);
+            $this->cacheCleanupId = null;
+        }
+    }
+
+    public function get(string|int $index): mixed
+    {
+        if (isset($this->cache[$index])) {
+            $obj = $this->cache[$index];
+            $ref = $obj->reference->get();
+            if ($ref !== null) {
+                $obj->ttl = \time() + $this->cacheTtl;
+                return $obj;
+            }
+            unset($this->cache[$index]);
+        }
+
+        $result = $this->inner->offsetGet($index);
+        if (isset($this->cache[$index])) {
+            return $this->cache[$index]->reference->get();
+        }
+
+        \assert($result instanceof DbObject);
+        $result->initDb($this->inner, $index, $this->config);
+
+        $this->cache[$index] = new ObjectReference($result, \time() + $this->cacheTtl);
+
+        return $result;
+    }
+
+    public function set(string|int $key, DbObject $value): void
+    {
+        if (isset($this->cache[$key]) && $this->cache[$key]->reference->get() === $value) {
+            return;
+        }
+        $value->initDb($this->inner, $key, $this->config);
+        $this->cache[$key] = new ObjectReference($value, \time() + $this->cacheTtl);
+        $this->inner->set($key, $value);
+    }
+
+    public function unset(string|int $key): void
+    {
+        unset($this->cache[$key]);
+        $this->inner->unset($key);
+    }
+
+    public function getIterator(): Traversable
+    {
+        $this->flushCache();
+        foreach ($this->inner->getIterator() as $key => $value) {
+            if (isset($this->cache[$key])) {
+                $obj = $this->cache[$key];
+                $ref = $obj->reference->get();
+                if ($ref !== null) {
+                    $obj->ttl = \time() + $this->cacheTtl;
+                    yield $obj;
+                    continue;
+                }
+            }
+            $value->initDb($this->inner, $key, $this->config);
+            $this->cache[$key] = new ObjectReference($value, \time() + $this->cacheTtl);
+            yield $value;
+        }
+    }
+
+    public function count(): int
+    {
+        $this->flushCache();
+        return $this->inner->count();
+    }
+
+    public function clear(): void
+    {
+        $lock = $this->mutex->acquire();
+        $this->cache = [];
+        $lock->release();
+
+        $this->inner->clear();
+    }
+
+    /**
+     * Flush all flushable keys.
+     */
+    public function flushCache(): void
+    {
+        $lock = $this->mutex->acquire();
+        try {
+            $now = \time();
+            $new = [];
+            foreach ($this->cache as $key => $value) {
+                if ($value->ttl > $now) {
+                    $value->obj = null;
+                }
+                if ($value->reference->get() !== null) {
+                    $new[$key] = $value;
+                }
+            }
+            $this->cache = $new;
+        } finally {
+            EventLoop::queue($lock->release(...));
+        }
+    }
+}
diff --git a/src/Internal/Containers/ObjectReference.php b/src/Internal/Containers/ObjectReference.php
new file mode 100644
index 0000000..3cce5d9
--- /dev/null
+++ b/src/Internal/Containers/ObjectReference.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+/**
+ * This file is part of AsyncOrm.
+ * AsyncOrm is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General private License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ * AsyncOrm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Affero General private License for more details.
+ * You should have received a copy of the GNU General private License along with AsyncOrm.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @author    Alexander Pankratov <alexander@i-c-a.su>
+ * @copyright 2016-2024 Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2024 Alexander Pankratov <alexander@i-c-a.su>
+ * @license   https://opensource.org/licenses/AGPL-3.0 AGPLv3
+ * @link https://daniil.it/AsyncOrm AsyncOrm documentation
+ */
+
+namespace danog\AsyncOrm\Internal\Containers;
+
+use danog\AsyncOrm\DbObject;
+use WeakReference;
+
+/** @internal */
+final class ObjectReference
+{
+    public readonly WeakReference $reference;
+    public ?DbObject $obj;
+    public function __construct(
+        DbObject $object,
+        public int $ttl
+    ) {
+        $this->obj = $object;
+        $this->reference = WeakReference::create($object);
+    }
+}
diff --git a/src/Internal/Driver/CachedArray.php b/src/Internal/Driver/CachedArray.php
index 77b5dd3..f9fafad 100644
--- a/src/Internal/Driver/CachedArray.php
+++ b/src/Internal/Driver/CachedArray.php
@@ -21,6 +21,7 @@ namespace danog\AsyncOrm\Internal\Driver;
 use danog\AsyncOrm\DbArray;
 use danog\AsyncOrm\Driver\MemoryArray;
 use danog\AsyncOrm\FieldConfig;
+use danog\AsyncOrm\Internal\Containers\CacheContainer;
 use Traversable;
 
 /**
@@ -54,7 +55,7 @@ final class CachedArray extends DbArray
             $previous->cache->flushCache();
             return $previous->cache->inner;
         }
-        $previous->cache->startCacheCleanupLoop($config->annotation->cacheTtl);
+        $previous->cache->startCacheCleanupLoop($config->cacheTtl);
         return $previous;
     }
 
@@ -68,6 +69,11 @@ final class CachedArray extends DbArray
         $this->cache->stopCacheCleanupLoop();
     }
 
+    public function flushCache(): void
+    {
+        $this->cache->flushCache();
+    }
+
     public function count(): int
     {
         return $this->cache->count();
diff --git a/src/Internal/Driver/ObjectArray.php b/src/Internal/Driver/ObjectArray.php
new file mode 100644
index 0000000..4d033bd
--- /dev/null
+++ b/src/Internal/Driver/ObjectArray.php
@@ -0,0 +1,102 @@
+<?php declare(strict_types=1);
+
+/**
+ * This file is part of AsyncOrm.
+ * AsyncOrm is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ * AsyncOrm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Affero General Public License for more details.
+ * You should have received a copy of the GNU General Public License along with AsyncOrm.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @author    Alexander Pankratov <alexander@i-c-a.su>
+ * @copyright 2016-2024 Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2024 Alexander Pankratov <alexander@i-c-a.su>
+ * @license   https://opensource.org/licenses/AGPL-3.0 AGPLv3
+ * @link https://daniil.it/AsyncOrm AsyncOrm documentation
+ */
+
+namespace danog\AsyncOrm\Internal\Driver;
+
+use danog\AsyncOrm\DbArray;
+use danog\AsyncOrm\Driver\MemoryArray;
+use danog\AsyncOrm\FieldConfig;
+use danog\AsyncOrm\Internal\Containers\ObjectContainer;
+use Traversable;
+
+/**
+ * Object caching proxy.
+ *
+ * @internal
+ *
+ * @template TKey as array-key
+ * @template TValue
+ *
+ * @extends DbArray<TKey, TValue>
+ */
+final class ObjectArray extends DbArray
+{
+    private readonly ObjectContainer $cache;
+
+    /**
+     * Get instance.
+     */
+    public static function getInstance(FieldConfig $config, DbArray|null $previous): DbArray
+    {
+        $new = $config->settings->getDriverClass();
+        if ($previous === null) {
+            $previous = new self($new::getInstance($config, null), $config);
+        } elseif ($previous instanceof self) {
+            $previous->cache->inner = $new::getInstance($config, $previous->cache->inner);
+            $previous->cache->config = $config;
+        } else {
+            $previous = new self($new::getInstance($config, $previous), $config);
+        }
+        if ($previous->cache->inner instanceof MemoryArray) {
+            $previous->cache->flushCache();
+            return $previous->cache->inner;
+        }
+        $previous->cache->startCacheCleanupLoop($config->cacheTtl);
+        return $previous;
+    }
+
+    public function __construct(DbArray $inner, FieldConfig $config)
+    {
+        $this->cache = new ObjectContainer($inner, $config);
+    }
+
+    public function __destruct()
+    {
+        $this->cache->stopCacheCleanupLoop();
+    }
+
+    public function count(): int
+    {
+        return $this->cache->count();
+    }
+
+    public function clear(): void
+    {
+        $this->cache->clear();
+    }
+
+    public function get(mixed $index): mixed
+    {
+        return $this->cache->get($index);
+    }
+
+    public function set(string|int $key, mixed $value): void
+    {
+        $this->cache->set($key, $value);
+    }
+
+    public function unset(string|int $key): void
+    {
+        $this->cache->unset($key);
+    }
+
+    public function getIterator(): Traversable
+    {
+        return $this->cache->getIterator();
+    }
+}
diff --git a/src/OrmObject.php b/src/OrmObject.php
deleted file mode 100644
index e69de29..0000000
diff --git a/src/ValueType.php b/src/ValueType.php
index 6a9a482..1d75ef6 100644
--- a/src/ValueType.php
+++ b/src/ValueType.php
@@ -30,13 +30,13 @@ enum ValueType: string
      */
     case INT = 'int';
     /**
-     * Objects, serialized as specified in the settings.
+     * Objects extending DbObject, serialized as specified in the settings.
      */
     case OBJECT = 'object';
     /**
-     * Values of any type, serialized as specified in the settings.
+     * Values of any scalar type, serialized as specified in the settings.
      *
-     * Using MIXED worsens performances, please use STRING, INT or OBJECT whenever possible.
+     * Using SCALAR worsens performances, please use STRING, INT or OBJECT whenever possible.
      */
-    case MIXED = 'object';
+    case SCALAR = 'scalar';
 }