diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 217d4dc..9ff23cd 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -1038,7 +1038,7 @@ public static function bootEnvironment($app_root = NULL) {
    * @throws \Symfony\Component\HttpKernel\Exception\BadRequestHttpException
    *   In case the host name in the request is not trusted.
    */
-  protected function initializeSettings(Request $request) {
+  public function initializeSettings(Request $request) {
     $site_path = static::findSitePath($request);
     $this->setSitePath($site_path);
     $class_loader_class = get_class($this->classLoader);
diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index 2324316..2c5f6fa 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -12,6 +12,7 @@
 use Drupal\Component\Utility\Html;
 use Drupal\Component\Utility\UrlHelper;
 use Drupal\Core\Database\Database;
+use Drupal\Core\DrupalKernel;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\Session\AnonymousUserSession;
 use Drupal\Core\Test\FunctionalTestSetupTrait;
@@ -27,6 +28,7 @@
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 use Symfony\Component\CssSelector\CssSelectorConverter;
+use Symfony\Component\HttpFoundation\Request;
 
 /**
  * Provides a test case for functional Drupal tests.
@@ -257,6 +259,13 @@
   protected $metaRefreshCount = 0;
 
   /**
+   * Path to SQL dump file.
+   *
+   * @var
+   */
+  protected $dumpFile;
+
+  /**
    * The app root.
    *
    * @var string
@@ -970,6 +979,44 @@ protected function getOptions($select, Element $container = NULL) {
    * Installs Drupal into the Simpletest site.
    */
   public function installDrupal() {
+    if (getenv('BROWSERTEST_CACHE_DB')) {
+      $this->initDumpFile();
+      if (file_exists($this->dumpFile)) {
+        $this->installDrupalFromDump();
+      }
+      else {
+        $this->installDrupalFromProfile();
+        $this->dumpDatabase();
+      }
+    }
+    else {
+      $this->installDrupalFromProfile();
+    }
+  }
+
+
+  /**
+   * Determines a proper file name for SQL dump.
+   */
+  protected function initDumpFile() {
+    $class = get_class($this);
+    $modules = [];
+    while ($class) {
+      if (property_exists($class, 'modules')) {
+        $modules = array_merge($modules, $class::$modules);
+      }
+      $class = get_parent_class($class);
+    }
+    sort($modules);
+    $cache_dir = getenv('BROWSERTEST_CACHE_DIR') ?: sys_get_temp_dir() . '/test_dumps/' . \Drupal::VERSION;
+    is_dir($cache_dir) || mkdir($cache_dir, 0777, TRUE);
+    $this->dumpFile = $cache_dir . '/_' . implode('-', $modules) . '.sql';
+  }
+
+  /**
+   * Installs Drupal using installation profile.
+   */
+  protected function installDrupalFromProfile() {
     $this->initUserSession();
     $this->prepareSettings();
     $this->doInstall();
@@ -981,6 +1028,94 @@ public function installDrupal() {
   }
 
   /**
+   * Installs Drupal using SQL dump.
+   */
+  protected function installDrupalFromDump() {
+
+    $this->restoreDatabase();
+
+    $this->initUserSession();
+    $this->prepareSettings();
+
+    $connection_info = Database::getConnectionInfo('default');
+
+    $databases['default']['default'] = (object) [
+      'value' =>  $connection_info['default'],
+      'required' => TRUE,
+    ];
+
+    $settings['databases'] = $databases;
+    $settings['settings']['hash_salt'] = (object) [
+      'value' => $this->databasePrefix,
+      'required' => TRUE,
+    ];
+
+    $settings['settings']['hash_salt'] = (object) [
+      'value' => $this->databasePrefix,
+      'required' => TRUE,
+    ];
+    $this->writeSettings($settings);
+
+    $autoloader = require './autoload.php';
+    $this->kernel = new DrupalKernel('prod', $autoloader);
+    DrupalKernel::bootEnvironment();
+    $request = Request::createFromGlobals();
+    $this->kernel->initializeSettings($request);
+    $this->kernel->boot()->preHandle($request);
+    $this->container = $this->kernel->getContainer();
+
+    // The value comes with the dump from previous installation.
+    \Drupal::configFactory()->getEditable('system.file')
+      ->set('path.temporary', $this->tempFilesDirectory)
+      ->save();
+    file_prepare_directory($this->tempFilesDirectory, FILE_MODIFY_PERMISSIONS | FILE_CREATE_DIRECTORY);
+  }
+
+  /**
+   * Dumps database structure and contents of test site.
+   */
+  protected function dumpDatabase() {
+    $connection_info = Database::getConnectionInfo('default');
+
+    $user = $connection_info['default']['username'];
+    $pass = $connection_info['default']['password'];
+    $db = $connection_info['default']['database'];
+
+    switch ($connection_info['default']['driver']) {
+      case 'mysql':
+        $tables = \Drupal::database()
+          ->query("SHOW TABLES LIKE '$this->databasePrefix%'")
+          ->fetchCol();
+        $tables_param = implode(' ', $tables);
+        exec("mysqldump -u$user -p$pass $db $tables_param | sed 's/$this->databasePrefix/default_db_prefix_/' > {$this->dumpFile}");
+        break;
+
+      default:
+        throw new \LogicException('This database driver is not supported yet.');
+    }
+  }
+
+  /**
+   * Restores database structure and contents of test site.
+   */
+  protected function restoreDatabase() {
+    $connection_info = Database::getConnectionInfo('default');
+
+    $user = $connection_info['default']['username'];
+    $pass = $connection_info['default']['password'];
+    $db = $connection_info['default']['database'];
+
+    switch ($connection_info['default']['driver']) {
+      case 'mysql':
+        exec("sed 's/default_db_prefix_/$this->databasePrefix/' $this->dumpFile | mysql -u$user -p$pass $db");
+        break;
+
+      default:
+        throw new \LogicException('This database driver is not supported yet.');
+    }
+  }
+
+  /**
    * Returns whether a given user account is logged in.
    *
    * @param \Drupal\Core\Session\AccountInterface $account