YouTube降低 CPU 负载脚本
将脚本粘贴到油猴扩展里。// ==UserScript==
// @name YouTube CPU-Tamer Upgrade (Firefox Optimized)
// @version 0.4.2
// @description Optimize CPU and GPU usage while watching YouTube videos on Firefox
// @author AstralRift
// @namespace https://greasyfork.org/users/1300060
// @match *://*.youtube.com/*
// @match *://*.youtube-nocookie.com/embed/*
// @match *://music.youtube.com/*
// @exclude *://*.youtube.com/*/*.{txt,png,jpg,jpeg,gif,xml,svg,manifest,log,ini}
// @run-at document-start
// @grant none
// @license MIT
// @downloadURL https://update.greasyfork.org/scripts/559844/YouTube%20CPU-Tamer%20Upgrade%20%28Firefox%20Optimized%29.user.js
// @updateURL https://update.greasyfork.org/scripts/559844/YouTube%20CPU-Tamer%20Upgrade%20%28Firefox%20Optimized%29.meta.js
// ==/UserScript==
(function () {
'use strict';
const win = typeof window !== 'undefined' ? window : this;
const scriptKey = 'YTB_CPUTamer_AstralRift';
if (win) return;
win = true;
const PromiseConstructor = Promise;
const ExternalPromise = (function () {
return function (cb) {
let res, rej;
const promise = new PromiseConstructor((resolve, reject) => {
res = resolve;
rej = reject;
});
if (!cb) {
promise.resolve = res;
promise.reject = rej;
} else {
cb(res, rej);
}
return promise;
};
})();
const checkGPUAcceleration = (function () {
try {
const canvas = document.createElement('canvas');
return !!(canvas.getContext('webgl') || canvas.getContext('experimental-webgl'));
} catch (e) {
return false;
}
})();
if (!checkGPUAcceleration) return;
const getTimeUpdate = (function () {
// FIX: 统一用 win，避免 iframe/非顶层环境写错对象
win.lastTimeUpdate = 1;
document.addEventListener('timeupdate', () => {
win.lastTimeUpdate = Date.now();
}, { capture: true, passive: true });
return function () {
try {
if (win.top && win.top !== win && win.top.lastTimeUpdate >= 1) {
return win.top.lastTimeUpdate;
}
} catch (e) { }
return win.lastTimeUpdate;
};
})();
const initializeContext = function (win) {
return new PromiseConstructor((resolve) => {
const waitForFrame = requestAnimationFrame;
let maxRetries = 20;
const frameId = 'vanillajs-iframe-v1';
let container = null;
let frame = document.getElementById(frameId);
const tryInject = () => {
if (!document.documentElement) return false;
if (!frame) {
frame = document.createElement('iframe');
frame.id = frameId;
frame.sandbox = 'allow-same-origin';
frame.style.display = 'none';
container = document.createElement('noscript');
container.appendChild(frame);
document.documentElement.appendChild(container);
}
return true;
};
const cleanup = (later) => {
const c = container;
container = null;
if (!c) return;
const rm = () => { try { c.remove(); } catch (e) { } };
if (later) setTimeout(rm, 200);
else rm();
};
(function pollContext() {
if (!tryInject()) {
if (maxRetries-- > 0) return waitForFrame(pollContext);
return resolve(null);
}
if (!frame.contentWindow && maxRetries-- > 0) {
return waitForFrame(pollContext);
}
const ctx = frame.contentWindow;
if (!ctx) {
cleanup(false);
return resolve(null);
}
try {
const { requestAnimationFrame, setInterval, setTimeout, clearInterval, clearTimeout } = ctx;
const bound = {
requestAnimationFrame: requestAnimationFrame.bind(win),
setInterval: setInterval.bind(win),
setTimeout: setTimeout.bind(win),
clearInterval: clearInterval.bind(win),
clearTimeout: clearTimeout.bind(win)
};
cleanup(true);
resolve(bound);
} catch (e) {
cleanup(false);
resolve(null);
}
})();
});
};
initializeContext(win).then((context) => {
if (!context) return;
const { requestAnimationFrame, setTimeout, setInterval, clearTimeout, clearInterval } = context;
let animationFrameInterrupter = null;
const createRAFHelper = function () {
const afEl = document.createElement('a-f');
afEl.id = 'a-f';
if (!('onanimationiteration' in afEl)) {
return (res) => {
animationFrameInterrupter = res;
requestAnimationFrame(res);
};
}
let queue = null;
afEl.onanimationiteration = () => {
const fn = queue;
if (fn) {
queue = null;
fn();
}
};
if (!document.getElementById('af-style')) {
const style = document.createElement('style');
style.id = 'af-style';
style.textContent = `
@keyframes aF1 { from { opacity: 0; } to { opacity: 1; } }
#a-f {
position: fixed; top: -1px; left: -1px; width: 1px; height: 1px;
pointer-events: none; visibility: hidden;
animation: 1ms linear infinite alternate aF1;
}
`;
(document.head || document.documentElement).appendChild(style);
}
if (document.documentElement) {
document.documentElement.insertBefore(afEl, document.documentElement.firstChild);
}
return (res) => {
queue = res;
animationFrameInterrupter = res;
};
};
const rafHelper = createRAFHelper();
(function () {
let afP1 = { resolved: true };
let afP2 = { resolved: true };
let afIdx = 0;
const resolveRAF = (p) => {
return new PromiseConstructor((res) => {
rafHelper(res);
}).then(() => {
p.resolved = true;
// FIX: 回绕逻辑与原脚本一致（9e9量级，回到9）
let t = ++afIdx;
if (t > 9000000000) afIdx = t = 9;
p.resolve(t);
return t;
});
};
const executeRAF = () => {
const p1 = !afP1.resolved ? afP1 : null;
const p2 = !afP2.resolved ? afP2 : null;
// FIX: 与原脚本一致：同时 pending 时取更合理的时间戳（含溢出区间判断）
if (p1 && p2) {
return PromiseConstructor.all().then(v => {
const t1 = v, t2 = v;
return (t1 > t2 && (t1 - t2) < 8000000000) ? t1 : t2;
});
}
const n1 = !p1 ? (afP1 = new ExternalPromise()) : null;
const n2 = !p2 ? (afP2 = new ExternalPromise()) : null;
return new PromiseConstructor((res) => {
const run = () => {
if (n1) {
resolveRAF(n1).then(t => {
if (n2) resolveRAF(n2).then(res);
else res(t);
});
} else if (n2) {
resolveRAF(n2).then(res);
} else {
res(0);
}
};
if (p2) p2.then(run);
else if (p1) p1.then(run);
else run();
});
};
const tasks = new Set();
const wrap = (fn, store) => {
return function () {
const now = Date.now();
if (now - getTimeUpdate() < 800 && now - store.last < 800) {
const tid = store.id;
tasks.add(tid);
executeRAF().then((t) => {
// FIX: 先删除，避免 tid 因为 t==store.exec 等原因长期滞留
const ok = tasks.delete(tid);
if (!ok || t === store.exec) return;
store.exec = t;
store.last = now;
fn();
});
} else {
store.last = now;
fn();
}
};
};
const makeWrapper = (orig) => {
return function (f, ms = 0) {
if (typeof f === 'function') {
// micro-opt: 预置字段，稳定对象形状
const store = { last: Date.now(), exec: 0, id: 0 };
const w = wrap(f, store);
store.id = orig(w, ms);
return store.id;
}
return orig(f, ms);
};
};
win.setTimeout = makeWrapper(setTimeout);
win.setInterval = makeWrapper(setInterval);
const makeClear = (orig) => {
return (id) => {
if (id) {
tasks.delete(id);
orig(id);
}
};
};
win.clearTimeout = makeClear(clearTimeout);
win.clearInterval = makeClear(clearInterval);
try {
const s = Function.prototype.toString;
win.setTimeout.toString = s.bind(setTimeout);
win.setInterval.toString = s.bind(setInterval);
win.clearTimeout.toString = s.bind(clearTimeout);
win.clearInterval.toString = s.bind(clearInterval);
} catch (e) { }
})();
let interrupter = null;
setInterval(() => {
if (interrupter === animationFrameInterrupter && interrupter !== null) {
animationFrameInterrupter();
interrupter = null;
} else {
interrupter = animationFrameInterrupter;
}
}, 125);
});
})();
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