render_perf_test.php

<?php

use Drupal\Component\Utility\Html;
use Drupal\Core\DrupalKernel;
use Symfony\Component\HttpFoundation\Request;

// Boot the environment.
$autoloader = require_once 'autoload.php';
$request = Request::createFromGlobals();
$kernel = DrupalKernel::createFromRequest($request, $autoloader, 'prod');
$kernel->boot();
$kernel->preHandle($request);

// Create test values.
$arr = array_fill(0,20, 'lorem ipsum');
$twig_render_array = ['#theme' => 'inline_list', '#items' => $arr];
$markup_render_array = ['#separator' => ', ', '#markup' => $arr];

// Do an unrelated render to set up stuff...
$renderer = \Drupal::service('renderer');
$markup = ['#markup' => 'ignore'];
$renderer->renderPlain($markup);

// Test #markup.
$time_start = microtime(true);
for ($i=0;$i<10;$i++) {
  $renderer->renderPlain($markup_render_array);
}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "#markup render array in $time seconds\n";

// Test twig template.
$time_start = microtime(true);
for ($i=0;$i<10;$i++) {
  $renderer->renderPlain($twig_render_array);
}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "Twig render array in $time seconds\n";

// Test implode().
$time_start = microtime(true);
for ($i=0;$i<10;$i++) {
  foreach ($arr as $value) {
    Html::escape($value);
  }
  implode(', ', $arr);
}
$time_end = microtime(true);
$time = $time_end - $time_start;

echo "Implode + Escape in $time seconds\n";