PureRender: Instant-Web

Clean, stable, and fast. PureRender accelerates your web experience by removing render-blocking elements, overlays, and layout-lagging effects for a seamless browsing experience.
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// ==UserScript==
// @name         PureRender: Instant-Web
// @namespace    https://github.com/wandersons13/PureRender
// @version      0.9
// @description  Clean, stable, and fast. PureRender accelerates your web experience by removing render-blocking elements, overlays, and layout-lagging effects for a seamless browsing experience.
// @author       wandersons13
// @match        *://*/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=speedtest.net
// @run-at       document-start
// @noframes
// @grant        GM_addStyle
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @license      GNU
// ==/UserScript==

(function () {
    "use strict";

    const host = location.hostname.toLowerCase();
    const href = location.href.toLowerCase();
    const referrer = (document.referrer || "").toLowerCase();

    const isYouTubeHost = (value) => /(^|\.)((youtube\.com)|(youtu\.be)|(youtube-nocookie\.com))$/.test(value);

    if (
        isYouTubeHost(host) ||
        href.includes("youtube.com/embed/") ||
        href.includes("youtube.com/live_embed") ||
        href.includes("youtube-nocookie.com") ||
        referrer.includes("youtube.com") ||
        referrer.includes("youtu.be") ||
        referrer.includes("youtube-nocookie.com")
    ) {
        return;
    }

    const userExcluded = GM_getValue("excluded_sites", []) || [];
    if (userExcluded.includes(host)) return;

    const blockedDomains = [
        "google-analytics.com", "googletagmanager.com", "connect.facebook.net",
        "hotjar.com", "scorecardresearch.com", "criteo.com", "quantserve.com",
        "adservice.google.com", "pagead2.googlesyndication.com"
    ];

    const originalFetch = window.fetch;
    window.fetch = function(...args) {
        const url = args[0] ? args[0].toString().toLowerCase() : "";
        if (blockedDomains.some(domain => url.includes(domain))) {
            return Promise.resolve(new Response("", { status: 204, statusText: "No Content" }));
        }
        return originalFetch.apply(this, args);
    };

    if (navigator.sendBeacon) {
        const originalBeacon = navigator.sendBeacon;
        navigator.sendBeacon = function(url, data) {
            const stringUrl = url ? url.toString().toLowerCase() : "";
            if (blockedDomains.some(domain => stringUrl.includes(domain))) {
                return true;
            }
            return originalBeacon.call(this, url, data);
        };
    }

    const originalSetTimeout = window.setTimeout;
    window.setTimeout = function(callback, delay, ...args) {
        if (typeof delay === 'number' && delay > 150 && delay < 3000) {
            delay = 10;
        }
        return originalSetTimeout.call(this, callback, delay, ...args);
    };

    GM_addStyle(`
        html, body {
            scroll-behavior: auto !important;
            visibility: visible !important;
            opacity: 1 !important;
        }

        img {
            image-rendering: -webkit-optimize-contrast;
        }

        iframe[src*="analytics"], iframe[src*="track"], iframe[src*="pixel"],
        [class*="preloader"], [id*="preloader"], [class*="loading-overlay"],
        [class*="skeleton"], [class*="spinner"], .loader, #loader {
            display: none !important;
            visibility: hidden !important;
            pointer-events: none !important;
        }

        * {
            backdrop-filter: none !important;
            -webkit-backdrop-filter: none !important;
        }

        *:not(input):not(textarea):not(select) {
            text-shadow: none !important;
        }
    `);

    const quickUnlock = () => {
        requestAnimationFrame(() => {
            if (!document.body) return;

            const style = getComputedStyle(document.body);

            if (style.overflow === "hidden" || style.position === "fixed") {
                document.body.style.setProperty("overflow", "auto", "important");
                document.body.style.setProperty("position", "static", "important");
                document.documentElement.style.setProperty("overflow", "auto", "important");
            }

            const forceEager = () => {
                document.querySelectorAll('img[loading="lazy"], iframe[loading="lazy"]').forEach(el => {
                    el.setAttribute("loading", "eager");
                });
            };

            forceEager();

            const observer = new MutationObserver((mutations) => {
                for (let mutation of mutations) {
                    if (mutation.addedNodes.length) {
                        forceEager();
                    }
                }
            });

            observer.observe(document.documentElement, {
                childList: true,
                subtree: true
            });
        });
    };

    window.addEventListener("DOMContentLoaded", quickUnlock, { once: true });
    window.addEventListener("load", quickUnlock, { once: true });

    GM_registerMenuCommand("🚫 Exclude this site", () => {
        const currentExcluded = GM_getValue("excluded_sites", []);
        if (!currentExcluded.includes(host)) {
            currentExcluded.push(host);
            GM_setValue("excluded_sites", currentExcluded);
            location.reload();
        }
    });

    GM_registerMenuCommand("🔄 Clear exclusion list", () => {
        if (confirm("Clear all exclusions?")) {
            GM_setValue("excluded_sites", []);
            location.reload();
        }
    });
})();