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NodeBB v3 Chat Very Slow

Moved Performance
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    @baris said: You should change your selectors so it doesn’t look at the entire document. You probably only want to apply fancybox to stuff inside the #content element which is what changes when the user navigates around the page. So use $('#content a').... for your selectors then the forum logo in the header won’t be selected. I modified the JS Fancybox code now and this code and it seem better // --------------------------------------------- // Fancybox Media Reader (Without Website Logo) // --------------------------------------------- if (top.location.pathname !== '/login') { $(window).on('action:posts.loaded', function(data) { console.log("Polling DOM for lazyLoaded images to apply Fancybox"); $(document).ready(function() { $('#content a').not('.forum-logo').not(".avatar").not(".emoji").not(".bmac-noanimate").each(function() { $('#content a[href*=".jpg"], #content a[href*=".jpeg"], #content a[href*=".png"], #content a[href*=".gif"], #content a[href*=".webp"]').addClass("noanimate"); }); }); }); } if (top.location.pathname !== '/login') { $(document).ready(function() { $(window).on('action:ajaxify.end', function(data) { $('#content a').not('.logo').not(".avatar").not(".emoji").not(".bmac-noanimate").each(function() { $('#content a[href*=".jpg"], #content a[href*=".jpeg"], #content a[href*=".png"], #content a[href*=".gif"], #content a[href*=".webp"]').addClass("noanimate"); data.preventDefault() // Strip out the images contained inside blockquotes as this looks nasty :) $('#content blockquote img').remove(); }); Fancybox.bind( '#content a[href*=".jpg"], #content a[href*=".jpeg"], #content a[href*=".png"], #content a[href*=".gif"], #content a[href*=".webp"]', { groupAll: true, } ); }); }); } // Chat fancybox - fires when chat module loaded and AJAX calls new chat $(document).ready(function() { $(window).on('action:chat.loaded', function(data) { // >>> Se limiter au contenu principal uniquement <<< $('#content img').not('.forum-logo').not(".avatar").not(".emoji").not(".bmac-noanimate").each(function() { var newHref = $(this).attr("src"); $(this).wrap("<a class='fancybox' href='" + newHref + "'/>"); $('#content a[href*=".jpg"], #content a[href*=".jpeg"], #content a[href*=".png"], #content a[href*=".gif"], #content a[href*=".webp"]').addClass("noanimate"); data.preventDefault(); // Strip out the images contained inside blockquotes as this looks nasty :) $('#content blockquote img').remove(); }); Fancybox.bind( '#content a[href*=".jpg"], #content a[href*=".jpeg"], #content a[href*=".png"], #content a[href*=".gif"], #content a[href*=".webp"]', { groupAll: true, } ); }); }); For the logo, I must use overflow: visible !important; on [component="brand/logo"] /* --- Logo --- */ [component="brand/logo"] { max-height: 50px; width: auto; height: auto; max-width: 100%; display: block; object-fit: contain; object-position: left center; overflow: visible !important; } Better result !!