Improve element query performance

Resolves #9806

Author: brandonkelly

CHANGELOG.md

@@ -8,6 +8,7 @@
 
 ### Changed
 - Improved the performance of applying drafts. ([#9802](https://github.com/craftcms/cms/issues/9802))
+- Improved the performance of element queries. ([#9806](https://github.com/craftcms/cms/discussions/9806))
 - Live Preview is once again supported by entries when the `autosaveDrafts` config setting is disabled.
 - Checkboxes, Dropdown, Multi-select, and Radio Buttons fields now include the selected options’ labels in their search keywords. ([#9799](https://github.com/craftcms/cms/issues/9799))
 - It’s now possible for field types to disable delta name registration for nested custom fields by calling `Craft::$app->view->setIsDeltaRegistrationActive(false);` before rendering them.

src/elements/db/ElementQuery.php

@@ -1437,6 +1437,7 @@ public function prepare($builder)
             ->from(['elements' => Table::ELEMENTS])
             ->innerJoin(['elements_sites' => Table::ELEMENTS_SITES], '[[elements_sites.elementId]] = [[elements.id]]')
             ->andWhere($this->where)
+            ->andWhere(['elements.type' => $this->elementType])
             ->offset($this->offset)
             ->limit($this->limit)
             ->addParams($this->params);