diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestSelectForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestSelectForm.php
index dab0434..ef5f351 100644
--- a/core/modules/system/tests/modules/form_test/src/Form/FormTestSelectForm.php
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestSelectForm.php
@@ -26,101 +26,16 @@ public function getFormId() {
   /**
    * {@inheritdoc}
    */
-  public function buildForm(array $form, FormStateInterface $form_state) {
-    $base = array(
-      '#type' => 'select',
-      '#options' => array('one' => 'one', 'two' => 'two', 'three' => 'three'),
-    );
-
-    $form['select'] = $base + array(
-      '#title' => '#default_value one',
-      '#default_value' => 'one',
-    );
-    $form['select_required'] = $base + array(
-      '#title' => '#default_value one, #required',
-      '#required' => TRUE,
-      '#default_value' => 'one',
-    );
-    $form['select_optional'] = $base + array(
-      '#title' => '#default_value one, not #required',
-      '#required' => FALSE,
-      '#default_value' => 'one',
-    );
-    $form['empty_value'] = $base + array(
-      '#title' => '#default_value one, #required, #empty_value 0',
-      '#required' => TRUE,
-      '#default_value' => 'one',
-      '#empty_value' => 0,
-    );
-    $form['empty_value_one'] = $base + array(
-      '#title' => '#default_value = #empty_value, #required',
-      '#required' => TRUE,
-      '#default_value' => 'one',
-      '#empty_value' => 'one',
-    );
-
-    $form['no_default'] = $base + array(
-      '#title' => 'No #default_value, #required',
-      '#required' => TRUE,
-    );
-    $form['no_default_optional'] = $base + array(
-      '#title' => 'No #default_value, not #required',
-      '#required' => FALSE,
-      '#description' => 'Should result in "one" because it is not required and there is no #empty_value requested, so default browser behavior of preselecting first option is in effect.',
-    );
-    $form['no_default_optional_empty_value'] = $base + array(
-      '#title' => 'No #default_value, not #required, #empty_value empty string',
-      '#empty_value' => '',
-      '#required' => FALSE,
-      '#description' => 'Should result in an empty string (due to #empty_value) because it is optional.',
-    );
-
-    $form['no_default_empty_option'] = $base + array(
-      '#title' => 'No #default_value, #required, #empty_option',
-      '#required' => TRUE,
-      '#empty_option' => '- Choose -',
-    );
-    $form['no_default_empty_option_optional'] = $base + array(
-      '#title' => 'No #default_value, not #required, #empty_option',
-      '#empty_option' => '- Dismiss -',
-      '#description' => 'Should result in an empty string (default of #empty_value) because it is optional.',
-    );
-
-    $form['no_default_empty_value'] = $base + array(
-      '#title' => 'No #default_value, #required, #empty_value 0',
-      '#required' => TRUE,
-      '#empty_value' => 0,
-      '#description' => 'Should never result in 0.',
-    );
-    $form['no_default_empty_value_one'] = $base + array(
-      '#title' => 'No #default_value, #required, #empty_value one',
-      '#required' => TRUE,
-      '#empty_value' => 'one',
-      '#description' => 'A mistakenly assigned #empty_value contained in #options should not be valid.',
-    );
-    $form['no_default_empty_value_optional'] = $base + array(
-      '#title' => 'No #default_value, not #required, #empty_value 0',
-      '#required' => FALSE,
-      '#empty_value' => 0,
-      '#description' => 'Should result in 0 because it is optional.',
-    );
-
-    $form['multiple'] = $base + array(
-      '#title' => '#multiple, #default_value two',
-      '#default_value' => array('two'),
-      '#multiple' => TRUE,
-    );
-    $form['multiple_no_default'] = $base + array(
-      '#title' => '#multiple, no #default_value',
-      '#multiple' => TRUE,
-    );
-    $form['multiple_no_default_required'] = $base + array(
-      '#title' => '#multiple, #required, no #default_value',
-      '#required' => TRUE,
-      '#multiple' => TRUE,
-    );
-
-    $form['submit'] = array('#type' => 'submit', '#value' => 'Submit');
+  public function buildForm(array $form, FormStateInterface $form_state, $select_elements = 0, $options_per_element = 0) {
+    for ($i = 0; $i < $select_elements; $i++) {
+      $form[$i] = [
+        '#type' => 'select',
+        '#options' => [],
+      ];
+      for ($j = 0; $j < $options_per_element; $j++) {
+        $form[$i]['#options'][$j] = $j;
+      }
+    }
     return $form;
   }
 
diff --git a/test.php b/test.php
new file mode 100644
index 0000000..1e6de91
--- /dev/null
+++ b/test.php
@@ -0,0 +1,17 @@
+<?php
+
+use Drupal\Core\DrupalKernel;
+use Symfony\Component\HttpFoundation\Request;
+
+$classloader = require_once __DIR__ . '/core/vendor/autoload.php';
+
+$request = Request::createFromGlobals();
+$kernel = DrupalKernel::createFromRequest($request, $classloader, 'prod');
+$kernel->boot()->preHandle($request);
+
+$before = microtime(TRUE);
+
+$form = \Drupal::formBuilder()->getForm('Drupal\form_test\Form\FormTestSelectForm', 100, 100);
+drupal_render($form);
+
+print 'Execution time: ' . (microtime(TRUE) - $before) . PHP_EOL;
\ No newline at end of file