To enhance YouTube performance by changing schedulerInstanceInstance_
// ==UserScript==
// @name YouTube schedulerInstanceInstance_ Tamer
// @namespace UserScripts
// @match https://www.youtube.com/*
// @grant none
// @version 0.1.0
// @license MIT
// @author CY Fung
// @description To enhance YouTube performance by changing schedulerInstanceInstance_
// @run-at document-start
// @unwrap
// @inject-into page
// @allFrames
// ==/UserScript==
(() => {
const Promise = (async () => { })().constructor;
const cleanContext = async (win) => {
const waitFn = requestAnimationFrame; // shall have been binded to window
try {
let mx = 16; // MAX TRIAL
const frameId = 'vanillajs-iframe-v1';
/** @type {HTMLIFrameElement | null} */
let frame = document.getElementById(frameId);
let removeIframeFn = null;
if (!frame) {
frame = document.createElement('iframe');
frame.id = 'vanillajs-iframe-v1';
frame.sandbox = 'allow-same-origin'; // script cannot be run inside iframe but API can be obtained from iframe
let n = document.createElement('noscript'); // wrap into NOSCRPIT to avoid reflow (layouting)
n.appendChild(frame);
while (!document.documentElement && mx-- > 0) await new Promise(waitFn); // requestAnimationFrame here could get modified by YouTube engine
const root = document.documentElement;
root.appendChild(n); // throw error if root is null due to exceeding MAX TRIAL
removeIframeFn = (setTimeout) => {
const removeIframeOnDocumentReady = (e) => {
e && win.removeEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
win = null;
setTimeout(() => {
n.remove();
n = null;
}, 200);
}
if (document.readyState !== 'loading') {
removeIframeOnDocumentReady();
} else {
win.addEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
}
}
}
while (!frame.contentWindow && mx-- > 0) await new Promise(waitFn);
const fc = frame.contentWindow;
if (!fc) throw "window is not found."; // throw error if root is null due to exceeding MAX TRIAL
const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, requestIdleCallback } = fc;
const res = { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, requestIdleCallback };
for (let k in res) res[k] = res[k].bind(win); // necessary
if (removeIframeFn) Promise.resolve(res.setTimeout).then(removeIframeFn);
res.animate = HTMLElement.prototype.animate;
jsonParseFix = {
_JSON: fc.JSON, _parse: fc.JSON.parse
}
return res;
} catch (e) {
console.warn(e);
return null;
}
};
let idleFrom = Date.now() + 2700;
let slowMode = false;
let ytEvented = false;
function setupEvents(){
document.addEventListener('yt-navigate', () => {
ytEvented = true;
slowMode = false;
idleFrom = Date.now() + 2700;
});
document.addEventListener('yt-navigate-start', () => {
ytEvented = true;
slowMode = false;
idleFrom = Date.now() + 2700;
});
document.addEventListener('yt-page-type-changed', () => {
ytEvented = true;
slowMode = false;
idleFrom = Date.now() + 1700;
});
document.addEventListener('yt-player-updated', () => {
ytEvented = true;
slowMode = false;
idleFrom = Date.now() + 1700;
});
document.addEventListener('yt-page-data-fetched', () => {
ytEvented = true;
slowMode = false;
idleFrom = Date.now() + 1700;
});
document.addEventListener('yt-navigate-finish', () => {
ytEvented = true;
slowMode = false;
let t = Date.now() + 700;
if(t>idleFrom) idleFrom = t;
});
document.addEventListener('yt-page-data-updated', () => {
ytEvented = true;
slowMode = false;
let t = Date.now() + 700;
if(t>idleFrom) idleFrom = t;
});
document.addEventListener('yt-watch-comments-ready', () => {
ytEvented = true;
slowMode = false;
let t = Date.now() + 700;
if(t>idleFrom) idleFrom = t;
});
}
cleanContext(window).then(__CONTEXT__ => {
if (!__CONTEXT__) return null;
const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, animate, requestIdleCallback } = __CONTEXT__;
// window.requestAnimationFrame=function(r){
// console.log(location.href)
// console.log((new Error()).stack);
// return requestAnimationFrame(r)
// }
let foregroundResolveFn = null;
let foregroundPromise = null;
const getForegroundPromise = () => {
if (document.visibilityState === 'visible') return Promise.resolve();
else {
return foregroundPromise = foregroundPromise || new Promise(resolve=>{
requestAnimationFrame(()=>{
foregroundPromise = null;
resolve();
});
});
}
}
new Promise(resolve => {
let cid = setInterval(() => {
let t = (((window || 0).ytglobal || 0).schedulerInstanceInstance_ || 0);
if (t) {
clearInterval(cid);
resolve(t);
}
}, 1);
}).then(schedulerInstanceInstance_ => {
if (!ytEvented) {
idleFrom = Date.now() + 2700;
slowMode = false; // integrity
}
const checkOK = typeof schedulerInstanceInstance_.start === 'function' && !schedulerInstanceInstance_.start991 && !schedulerInstanceInstance_.stop && !schedulerInstanceInstance_.cancel && !schedulerInstanceInstance_.terminate && !schedulerInstanceInstance_.interupt;
if (checkOK) {
schedulerInstanceInstance_.start991 = schedulerInstanceInstance_.start;
let pp = Promise.resolve();
let requestingFn = null;
let requestingArgs = null;
let requestingDT = 0;
let timerId = null;
const entries = [];
const f = function () {
requestingFn = this.fn;
requestingArgs = [...arguments];
requestingDT = Date.now();
entries.push({
fn: requestingFn,
args: requestingArgs,
t: requestingDT
});
// if (Date.now() < idleFrom) {
// timerId = this.fn.apply(window, arguments);
// } else {
// timerId = this.fn.apply(window, arguments);
// }
// timerId = 12377;
return 12377;
}
const fakeFns = [
f.bind({ fn: requestAnimationFrame }),
f.bind({ fn: setInterval }),
f.bind({ fn: setTimeout }),
f.bind({ fn: requestIdleCallback })
]
let timerResolve = null;
setInterval(() => {
timerResolve && timerResolve();
timerResolve = null;
if (!slowMode && Date.now() > idleFrom) slowMode = true;
}, 250);
let mzt = 0;
let fnSelectorProp = null;
schedulerInstanceInstance_.start = function () {
const mk1 = window.requestAnimationFrame
const mk2 = window.setInterval
const mk3 = window.setTimeout
const mk4 = window.requestIdleCallback
const tThis = this['$$12378$$'] || this;
window.requestAnimationFrame = fakeFns[0]
window.setInterval = fakeFns[1]
window.setTimeout = fakeFns[2]
window.requestIdleCallback = fakeFns[3]
fnSelectorProp = null;
tThis.start991.call(new Proxy(tThis, {
get(target, prop, receiver) {
if (prop === '$$12377$$') return true;
if (prop === '$$12378$$') return target;
// console.log('get',prop)
return target[prop]
},
set(target, prop, value, receiver) {
// console.log('set', prop, value)
if (value >= 1 && value <= 4) fnSelectorProp = prop;
if (value === 12377 && fnSelectorProp) {
const originalSelection = target[fnSelectorProp];
const timerIdProp = prop;
/*
case 1:
var a = this.K;
this.g = this.I ? window.requestIdleCallback(a, {
timeout: 3E3
}) : window.setTimeout(a, ma);
break;
case 2:
this.g = window.setTimeout(this.M, this.N);
break;
case 3:
this.g = window.requestAnimationFrame(this.L);
break;
case 4:
this.g = window.setTimeout(this.J, 0)
}
*/
const doForegroundSlowMode = () => {
const tir = ++mzt;
const f = requestingArgs[0];
getForegroundPromise().then(() => {
new Promise(r => {
timerResolve = r
}).then(() => {
if (target[timerIdProp] === -tir) f();
});
})
target[fnSelectorProp] = 931;
target[prop] = -tir;
}
if (target[fnSelectorProp] === 2 && requestingFn === setTimeout) {
if (slowMode && !(requestingArgs[1] > 250)) {
doForegroundSlowMode();
} else {
target[prop] = setTimeout.apply(window, requestingArgs);
}
} else if (target[fnSelectorProp] === 3 && requestingFn === requestAnimationFrame) {
if (slowMode) {
doForegroundSlowMode();
} else {
target[prop] = requestAnimationFrame.apply(window, requestingArgs);
}
} else if (target[fnSelectorProp] === 4 && requestingFn === setTimeout && !requestingArgs[1]) {
const f = requestingArgs[0];
const tir = ++mzt;
Promise.resolve().then(() => {
if (target[timerIdProp] === -tir) f();
});
target[fnSelectorProp] = 930;
target[prop] = -tir;
} else if (target[fnSelectorProp] === 1 && (requestingFn === requestIdleCallback || requestingFn === setTimeout)) {
doForegroundSlowMode();
} else {
// target[prop] = timerId;
target[fnSelectorProp] = 0;
target[prop] = 0;
}
// *****
// console.log('[[set]]', slowMode , prop, value, `fnSelectorProp: ${originalSelection} -> ${target[fnSelectorProp]}`)
} else {
target[prop] = value;
}
// console.log('set',prop,value)
return true;
}
}));
fnSelectorProp = null;
window.requestAnimationFrame = mk1;
window.setInterval = mk2
window.setTimeout = mk3
window.requestIdleCallback = mk4;
}
schedulerInstanceInstance_.start.toString = function () {
return schedulerInstanceInstance_.start991.toString();
}
const funcNames = [...(schedulerInstanceInstance_.start + "").matchAll(/[\(,]this\.(\w{1,2})[,\)]/g)].map(e => e[1]).map(prop => ({
prop,
value: schedulerInstanceInstance_[prop],
type: typeof schedulerInstanceInstance_[prop]
}));
// console.log('fcc', funcNames)
}
}).catch(console.warn);
});
setupEvents();
})();