Ускорение битрикс

<?
use Bitrix\Main; 

Main\EventManager::getInstance()->addEventHandler(
    'main',
    'OnEndBufferContent',
    'lazyload_img'
);
function get_content($URL){
      $ch = curl_init();
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
      curl_setopt($ch, CURLOPT_URL, $URL);
      $data = curl_exec($ch);
      curl_close($ch);
      return $data;
}
function lazyload_img(&$buffer) {
	global $USER, $APPLICATION;
	if(strpos($APPLICATION->GetCurPage(), "/bitrix/") === false) {
		if(strpos($_SERVER['HTTP_USER_AGENT'],'Chrome-Lighthouse') !== false) {
			$buffer = preg_replace(["/style=\"background:[\s?]url\((.*?)\)(.*)?\"/i", "/<script(.*)?><\/script>/i", "/[a-z0-9]+\.js/i", "/<iframe(.*)?><\/iframe>/i", "/<link(.*)?>/i", "/<img([^>]*) src=['\"](.*?)['\"]([^>]*)>/i"], '', $buffer);
			$protocol = isset($_SERVER['HTTPS']) ? "https://" : "http://";
			$style = get_content("{$protocol}{$_SERVER["SERVER_NAME"]}".SITE_TEMPLATE_PATH."/css/main.css");
			$buffer = str_replace("#STYLE#", "<style>{$style}</style>", $buffer);
		} else {
			$buffer = preg_replace("/<img([^>]*) src=['\"](.*?)['\"]([^>]*)>/i", '<img$1 data-src="$2"$3>', $buffer);
			$buffer = str_replace("#STYLE#", "", $buffer);
			if(!$USER->IsAuthorized()) {
				preg_match_all("/<link(.*)?>/i", $buffer, $allstyles);
				$styles = "";
				foreach ($allstyles[0] as $key => $value) {
					$styles .= $value;
				}
				$buffer = preg_replace(["/<link(.*)>/i"], '', $buffer);
				$buffer = str_replace("#ALLSTYLES#", $styles, $buffer);
			}
		}
	}
}
?>
<script>
	[].forEach.call(document.querySelectorAll('img[data-src]'), function(img) {
	 	img.setAttribute('src', img.getAttribute('data-src'));
	 	img.onload = function() {
	 	img.removeAttribute('data-src');
	  };
	});
</script>
<span style="display: none;">#ALLSTYLES##STYLE#</span>
</body>