// ==UserScript==
// @name YouTube CPU Tamer – Hybrid Edition (Improved)
// @name:ja YouTube CPU負荷軽減スクリプト – ハイブリッド方式（改良版）
// @name:en YouTube CPU Tamer – Hybrid Edition (Improved)
// @name:zh-CN YouTube CPU减负脚本 – 混合策略（改进版）
// @name:zh-TW YouTube CPU負載減輕工具 – 混合策略（改良版）
// @name:ko YouTube CPU 부하 감소 스크립트 – 하이브리드 방식(개선판)
// @name:fr Réducteur de charge CPU YouTube – Édition Hybride (Améliorée)
// @name:es Reductor de carga de CPU para YouTube – Edición Híbrida (Mejorada)
// @name:de YouTube CPU-Last-Reduzierer – Hybrid-Edition (Verbessert)
// @name:pt-BR Redutor de uso da CPU no YouTube – Edição Híbrida (Aprimorada)
// @name:ru Снижение нагрузки на CPU в YouTube – Гибридная версия (Улучшенная)
// @version 4.01
// @description Reduce CPU load on YouTube using hybrid DOMMutation + AnimationFrame strategy with dynamic switching and delay correction
// @description:ja DOM変化とrequestAnimationFrameを組み合わせたハイブリッド戦略でYouTubeのCPU負荷を大幅軽減！遅延補正＆動的切替も搭載。
// @description:en Reduce CPU load on YouTube using hybrid DOMMutation + AnimationFrame strategy with dynamic switching and delay correction
// @description:zh-CN 使用混合DOMMutation和requestAnimationFrame策略动态切换并校正延迟，降低YouTube的CPU负载
// @description:zh-TW 採用混合DOMMutation與requestAnimationFrame策略，動態切換並修正延遲，降低YouTube的CPU負載
// @description:ko DOM 변화 감지 + 애니메이션 프레임 전략으로 YouTube CPU 부하 감소, 지연 보정 및 동적 전환 포함
// @description:fr Réduisez la charge CPU de YouTube avec une stratégie hybride DOMMutation + AnimationFrame, avec commutation dynamique et correction du délai
// @description:es Reduce la carga de CPU en YouTube mediante una estrategia híbrida de DOMMutation y AnimationFrame, con conmutación dinámica y corrección de retrasos
// @description:de Reduzieren Sie die CPU-Last von YouTube mit einer hybriden DOMMutation + AnimationFrame-Strategie mit dynamischem Wechsel und Verzögerungskorrektur
// @description:pt-BR Reduza o uso da CPU no YouTube com uma estratégia híbrida DOMMutation + AnimationFrame com troca dinâmica e correção de atraso
// @description:ru Снижение нагрузки на CPU в YouTube с помощью гибридной стратегии DOMMutation + requestAnimationFrame с динамическим переключением и коррекцией задержки
// @namespace https://github.com/koyasi777/youtube-cpu-tamer-hybrid
// @author koyasi777
// @match https://www.youtube.com/*
// @match https://www.youtube.com/embed/*
// @match https://www.youtube-nocookie.com/embed/*
// @match https://music.youtube.com/*
// @run-at document-start
// @grant none
// @inject-into page
// @license MIT
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @homepageURL https://github.com/koyasi777/youtube-cpu-tamer-hybrid
// @supportURL https://github.com/koyasi777/youtube-cpu-tamer-hybrid/issues
// @downloadURL none
// ==/UserScript==
(() => {
"use strict";
/**
* Guard – avoid double‑instantiation on SPA navigation
*/
const FLAG = "__yt_cpu_tamer_hybrid_running__";
if (window[FLAG]) return;
window[FLAG] = true;
/*************************************************************************
* Helpers
*************************************************************************/
const nextAnimationFrame = () => new Promise(r => requestAnimationFrame(r));
const waitForDocReady = async () => {
while (!document.documentElement || !document.head) {
await nextAnimationFrame();
}
};
/**
* A thin extended‑Promise that exposes resolve()/reject() – convenient for
* bridging observer + rAF based triggers without extra closures.
*/
const PromiseExt = (() => {
let _res, _rej;
const shim = (r, j) => {
_res = r;
_rej = j;
};
return class extends Promise {
constructor(cb = shim) {
super(cb);
if (cb === shim) {
/** @type {(value?: unknown) => void} */
// @ts-ignore – dynamically injected
this.resolve = _res;
/** @type {(reason?: any) => void} */
// @ts-ignore
this.reject = _rej;
}
}
};
})();
/*************************************************************************
* Main
*************************************************************************/
const setup = async () => {
await waitForDocReady();
/***** 1. Create helper iframe that owns lightweight timers *****/
const FRAME_ID = "yt-cpu-tamer-timer-frame";
let frame = document.getElementById(FRAME_ID);
if (!frame) {
frame = document.createElement("iframe");
frame.id = FRAME_ID;
frame.style.display = "none";
// Allow both same‑origin and script execution so that callbacks routed
// through the iframe don’t hit the Chrome sandbox error.
frame.sandbox = "allow-same-origin allow-scripts";
// Use srcdoc to keep the iframe same‑origin (& blank) in all browsers.
frame.srcdoc = "yt-cpu-tamer";
document.documentElement.appendChild(frame);
}
// Wait until the inner window is ready.
while (!frame.contentWindow) {
await nextAnimationFrame();
}
const {
requestAnimationFrame: frameRAF,
setTimeout: frameSetTimeout,
setInterval: frameSetInterval,
clearTimeout: frameClearTimeout,
clearInterval: frameClearInterval
} = /** @type {Window & typeof globalThis} */ (frame.contentWindow);
/***** 2. Trigger generator – rAF when visible, MutationObserver otherwise *****/
const dummy = document.createElement("div");
dummy.style.display = "none";
document.documentElement.appendChild(dummy);
/** @returns {(cb: () => void) => Promise} */
const makeHybridTrigger = () => {
if (document.visibilityState === "visible") {
return cb => {
const p = new PromiseExt();
requestAnimationFrame(p.resolve);
return p.then(cb);
};
} else {
return cb => {
const p = new PromiseExt();
const MO = new MutationObserver(() => {
MO.disconnect();
p.resolve();
});
MO.observe(dummy, { attributes: true });
dummy.setAttribute("data-yt-cpu-tamer", Math.random().toString(36));
return p.then(cb);
};
}
};
/** @type {(cb: () => void) => Promise} */
let currentTrigger = makeHybridTrigger();
document.addEventListener("visibilitychange", () => {
currentTrigger = makeHybridTrigger();
});
/***** 3. Timer patching *****/
const activeTimeouts = new Set();
const activeIntervals = new Set();
/**
* Wrap native timer so that:
* – scheduling is done with *iframe* timers (very cheap)
* – execution is throttled by currentTrigger
* – callback runs in the *main* window realm (fn.apply(window,…))
*/
const makeTimer = (nativeTimer, pool) => {
return function patchedTimer(fn, delay = 0, ...args) {
if (typeof fn !== "function") return nativeTimer(fn, delay, ...args);
const id = nativeTimer(() => {
currentTrigger(() => fn.apply(window, args));
}, delay);
pool.add(id);
return id;
};
};
const makeClear = (nativeClear, pool) => id => {
if (pool.has(id)) pool.delete(id);
nativeClear(id);
};
/**
* Apply / re‑apply the patches (re‑applied on yt‑navigate‑finish).
*/
const patchTimers = () => {
window.setTimeout = makeTimer(frameSetTimeout, activeTimeouts);
window.setInterval = makeTimer(frameSetInterval, activeIntervals);
window.clearTimeout = makeClear(frameClearTimeout, activeTimeouts);
window.clearInterval = makeClear(frameClearInterval, activeIntervals);
// Align Function.prototype.toString() so that devtools show native code
const mirrorToString = (patched, native) => {
try {
patched.toString = native.toString.bind(native);
} catch {/* ignore */}
};
mirrorToString(window.setTimeout, frameSetTimeout);
mirrorToString(window.setInterval, frameSetInterval);
mirrorToString(window.clearTimeout, frameClearTimeout);
mirrorToString(window.clearInterval, frameClearInterval);
console.log("[YouTube CPU Tamer – Hybrid Edition] Timers patched");
};
// Initial patch (DOMContentLoaded OR immediate if already interactive).
if (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", patchTimers, { once: true });
} else {
patchTimers();
}
/***** 4. Re‑patch on SPA navigations *****/
window.addEventListener("yt-navigate-finish", () => {
console.log("[YouTube CPU Tamer] yt-navigate-finish – re‑applying patch");
patchTimers();
});
};
setup().catch(err => console.error("[YouTube CPU Tamer] setup failed", err));
})();