yii\db\Connection::createCommand() removed DI usage for performance reasons

framework/CHANGELOG.md

@@ -64,7 +64,7 @@ Yii Framework 2 Change Log
 - Enh #7405: Added `yii\filters\auth\AuthMethod::optional` for optional authentification in all child classes (SilverFire)
 - Enh #7566: Improved `\yii\validators\CompareValidator` default messages (slinstj)
 - Enh #7581: Added ability to specify range using anonymous function in `RangeValidator` (RomeroMsk)
-- Enh #7674: Added `yii\db\Connection::commandClass` to configure a command class that will be used by the connection (sammousa, silverfire)
+- Enh #7674: Added `yii\db\Connection::commandClass` to configure a command class that will be used by the connection (sammousa, silverfire, cebe)
 - Enh #8284: Added `\yii\captcha\CaptchaAction::$imageLibrary` property allowing to set image rendering library (AnatolyRugalev)
 - Enh #8329: Added support of options for `message` console command (vchenin)
 - Enh #8613: `yii\widgets\FragmentCache` will not store empty content anymore which fixes some problems related to `yii\filters\PageCache` (kidol)

framework/db/Connection.php

@@ -626,10 +626,10 @@ class Connection extends Component
      */
     public function createCommand($sql = null, $params = [])
     {
-        $command = Yii::createObject([
-            'class' => $this->commandClass,
+        /** @var Command $command */
+        $command = new $this->commandClass([
             'db' => $this,
-            'sql' => $sql
+            'sql' => $sql,
         ]);
 
         return $command->bindValues($params);