Как оптимизировать сайт и интернет-магазин на Битрикс по рекомендациям Google PageSpeed Insights

<link rel="stylesheet" type="text/css" href="style.css">
<script type="text/javascript" src="<a href="script.js">

pagespeed on; 
include bx/conf/pagespeed.conf; 

pagespeed RewriteLevel CoreFilters;

\Bitrix\Main\UI\Extension::load("ui.vue");
\Bitrix\Main\UI\Extension::load("ui.vue.directives.lazyload");

<div id="images_list"></div>

<img 
	v-bx-lazyload
	data-lazyload-src="<?=$arItem['PREVIEW_PICTURE']['SRC']?>"
	data-lazyload-error-src="https://via.placeholder.com/300/FF0000"
	src="https://via.placeholder.com/300"
	alt="<?=$arItem['PREVIEW_PICTURE']['ALT']?>"
	data-lazyload-dont-hide
/>

src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8Vw8AAoEBfymqrywAAAAASUVORK5CYII=" 

BX.Vue.create({
    el: '#images_list'  
});

CJSCore::Init(array("jquery"));
$this->addExternalJS(SITE_TEMPLATE_PATH . "/js/lazyload.min.js");

<picture>
    <source type="image/webp" data-srcset="<?=$arItem['PICTURE_WEBP']['WEBP_SRC']?>">
    <source type="<?=$arItem['PICTURE_WEBP']['CONTENT_TYPE']?>" data-srcset="<?=$arItem['PICTURE_WEBP']['SRC']?>">
    <img class="lazy" data-src="<?=$arItem['PICTURE_WEBP']['SRC']?>" alt="<?=$arItem['PICTURE_WEBP']['ALT']?>">
</picture>

$(document).ready(function() {
	var lazyLoadInstance = new LazyLoad({
	    elements_selector: ".lazy"
	});	
});

<? 
use Bitrix\Main\Page\Asset; // подключение css-стилей Asset::getInstance()->addCss("/bitrix/css/main/bootstrap.min.css"); // подключение js-скриптов Asset::getInstance()->addJs(SITE_TEMPLATE_PATH . "/js/myscripts.js"); // подключение произвольных кусков кода (сторонних файлов) Asset::getInstance()->addString("<link rel='shortcut icon' href='/local/images/favicon.ico' />"); ?>

<? 
$this->getTemplate()->addExternalCss("/local/addcss.css"); 
$this->getTemplate()->addExternalJs("/local/addcss.css"); 
?>

<link rel="stylesheet" href="/build/assets/styles/app.css"> — основные стили 
echo '<meta http-equiv="Content-Type" content="text/html; charset='.LANG_CHARSET.'"'.(true? ' /':'').'>'."\n"; 
$APPLICATION->ShowMeta("robots", false, true); 
$APPLICATION->ShowMeta("keywords", false, true); 
$APPLICATION->ShowMeta("description", false, true); 
$APPLICATION->ShowLink("canonical", null, true)

$APPLICATION->ShowCSS(true, true); 
$APPLICATION->ShowHeadStrings(); 
$APPLICATION->ShowHeadScripts();

body {font-family: 'FirstFont', 'SecondFont', sans-serif;}

function loadScript(src) { 
var s = document.createElement('script'); 
s.src = src; 
document.body.appendChild(s) 
} 
setTimeout(function() { loadScript('/js/task24807.js') }, 2000);