Greasy Fork is available in English.
It reduces the high CPU usage on Super Chats with nothing to lose.
// ==UserScript==
// @name YouTube Live CPU Tamer
// @name:ja YouTube Live CPU Tamer
// @name:zh-CN YouTube Live CPU Tamer
// @description It reduces the high CPU usage on Super Chats with nothing to lose.
// @description:ja スーパーチャットによる高いCPU使用率を削減します。見た目は何も変わりません。
// @description:zh-CN 降低超级聊天的高CPU利用率。外观完全没有变化。
// @namespace knoa.jp
// @include https://www.youtube.com/live_chat*
// @include https://www.youtube.com/live_chat_replay*
// @version 2.0.6
// @grant none
// ==/UserScript==
(function(){
const SCRIPTID = 'YouTubeLiveCpuTamer';
const SCRIPTNAME = 'YouTube Live CPU Tamer';
const DEBUG = false;/*
[update] 2.0.6
No updates on code. Just confirmed to work.
[bug]
[todo]
[possible]
[research]
Proxyを使うとbackgroundトリック不要？CPU使用に対する効果はある？
放送開始前の待機画面でもHelper(GPU)が食ってる件
リアルタイム視聴時のほうがHelper(GPU)が消費する件は新着確認js処理のせいか
[memo]
none:80+30=110 => tame:50+20=70 => remove:30+15=45
*/
if(console.time) console.time(SCRIPTID);
const MS = 1, SECOND = 1000*MS, MINUTE = 60*SECOND, HOUR = 60*MINUTE, DAY = 24*HOUR, WEEK = 7*DAY, MONTH = 30*DAY, YEAR = 365*DAY;
const THROTTLE = 1000*MS;
const site = {
targets: {
itemsNode: () => $('yt-live-chat-ticker-renderer #items'),
},
get: {
tickerItemInsideContainers: (items) => items.querySelectorAll('.yt-live-chat-ticker-renderer[role="button"] #container'),/* existing items */
tickerItemInsideContainer: (node) => node.querySelector('.yt-live-chat-ticker-renderer[role="button"] #container'),/* for observer */
},
};
let elements = {};
const core = {
initialize: function(){
elements.html = document.documentElement;
elements.html.classList.add(SCRIPTID);
text.setup(texts, top.document.documentElement.lang);
core.ready();
core.addStyle('style');
},
ready: function(){
core.getTargets(site.targets).then(() => {
log("I'm ready.");
core.observeTickerItems();
core.prepareRemoveTickersButton();
});
},
observeTickerItems: function(){
let containers = site.get.tickerItemInsideContainers(elements.itemsNode);
Array.from(containers).forEach(container => {
core.observeTickerItemInsideContainer(container);
});
observe(elements.itemsNode, function(records){
records.forEach(r => r.addedNodes.forEach(node => {
let container = site.get.tickerItemInsideContainer(node);
if(container) core.observeTickerItemInsideContainer(container);
}));
});
},
observeTickerItemInsideContainer: function(container){
container.parentNode.style.background = container.style.background;
let lastUpdated = Date.now();
observe(container, function(records){
let now = Date.now();
if(now - lastUpdated < THROTTLE) return;
lastUpdated = now;
container.parentNode.style.background = container.style.background;
}, {attributes: true, attributeFilter: ['style']});
},
prepareRemoveTickersButton: function(){
let button = createElement(html.removeTickersButton());
button.addEventListener('click', function(e){
elements.itemsNode.parentNode.removeChild(elements.itemsNode);
});
elements.itemsNode.parentNode.appendChild(button);
},
getTarget: function(selector, retry = 10){
const key = selector.name;
const get = function(resolve, reject, retry){
let selected = selector();
if(selected && selected.length > 0) selected.forEach((s) => s.dataset.selector = key);/* elements */
else if(selected instanceof HTMLElement) selected.dataset.selector = key;/* element */
else if(--retry) return log(`Not found: ${key}, retrying... (${retry})`), setTimeout(get, 1000, resolve, reject, retry);
else return reject(selector);
elements[key] = selected;
resolve(selected);
};
return new Promise(function(resolve, reject){
get(resolve, reject, retry);
}).catch(selector => {
log(`Not found: ${key}, I give up.`);
});
},
getTargets: function(selectors, retry = 10){
return Promise.all(Object.values(selectors).map(selector => core.getTarget(selector, retry)));
},
addStyle: function(name = 'style'){
if(html[name] === undefined) return;
let style = createElement(html[name]());
document.head.appendChild(style);
if(elements[name] && elements[name].isConnected) document.head.removeChild(elements[name]);
elements[name] = style;
},
};
const texts = {
'remove tickers by ${SCRIPTNAME}': {
en: () => `remove tickers by ${SCRIPTNAME}`,
ja: () => `履歴欄を削除 by ${SCRIPTNAME}`,
zh: () => `删除历史记录栏 by ${SCRIPTNAME}`,
},
};
const html = {
removeTickersButton: () => `<button id="${SCRIPTID}-removeTickers" title="${text('remove tickers by ${SCRIPTNAME}')}">╳</button>`,
style: () => `
<style type="text/css">
yt-live-chat-ticker-renderer #items > *{
border-radius: 999px;
}
yt-live-chat-ticker-renderer #items > * > #container{
background: none !important;
}
yt-live-chat-ticker-renderer #${SCRIPTID}-removeTickers{
cursor: pointer;
position: absolute;
top: 50%;
left: 5px;
transform: translateY(-50%);
border-radius: 100vmax;
border: none;
background: white;
filter: drop-shadow(0px 0px 1px rgba(0,0,0,.25));
height: 20px;
width: 20px;
padding: 0 !important;
opacity: 0;
transition: opacity 250ms;
pointer-events: none;
}
yt-live-chat-ticker-renderer:hover #left-arrow-container[hidden] ~ #${SCRIPTID}-removeTickers{
opacity: 1;
pointer-events: auto;
}
yt-live-chat-ticker-renderer #items > *{
transition: transform 250ms;
}
yt-live-chat-ticker-renderer:hover #items > *{
transform: translateX(5px);
}
</style>
`,
};
const text = function(key, ...args){
if(text.texts[key] === undefined){
log('Not found text key:', key);
return key;
}else return text.texts[key](args);
};
text.setup = function(texts, language){
let languages = [...window.navigator.languages];
if(language) languages.unshift(...String(language).split('-').map((p,i,a) => a.slice(0,1+i).join('-')).reverse());
if(!languages.includes('en')) languages.push('en');
languages = languages.map(l => l.toLowerCase());
Object.keys(texts).forEach(key => {
Object.keys(texts[key]).forEach(l => texts[key][l.toLowerCase()] = texts[key][l]);
texts[key] = texts[key][languages.find(l => texts[key][l] !== undefined)] || (() => key);
});
text.texts = texts;
};
const $ = function(s, f){
let target = document.querySelector(s);
if(target === null) return null;
return f ? f(target) : target;
};
const $$ = function(s, f){
let targets = document.querySelectorAll(s);
return f ? Array.from(targets).map(t => f(t)) : targets;
};
const createElement = function(html = '<span></span>'){
let outer = document.createElement('div');
outer.innerHTML = html;
return outer.firstElementChild;
};
const observe = function(element, callback, options = {childList: true, attributes: false, characterData: false, subtree: false}){
let observer = new MutationObserver(callback.bind(element));
observer.observe(element, options);
return observer;
};
const log = function(){
if(!DEBUG) return;
let l = log.last = log.now || new Date(), n = log.now = new Date();
let error = new Error(), line = log.format.getLine(error), callers = log.format.getCallers(error);
//console.log(error.stack);
console.log(
SCRIPTID + ':',
/* 00:00:00.000 */ n.toLocaleTimeString() + '.' + n.getTime().toString().slice(-3),
/* +0.000s */ '+' + ((n-l)/1000).toFixed(3) + 's',
/* :00 */ ':' + line,
/* caller.caller */ (callers[2] ? callers[2] + '() => ' : '') +
/* caller */ (callers[1] || '') + '()',
...arguments
);
};
log.formats = [{
name: 'Firefox Scratchpad',
detector: /MARKER@Scratchpad/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Console',
detector: /MARKER@debugger/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Greasemonkey 3',
detector: /\/gm_scripts\//,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Greasemonkey 4+',
detector: /MARKER@user-script:/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 500,
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Tampermonkey',
detector: /MARKER@moz-extension:/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 6,
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Chrome Console',
detector: /at MARKER \(<anonymous>/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(<anonymous>)/gm),
}, {
name: 'Chrome Tampermonkey',
detector: /at MARKER \(chrome-extension:.*?\/userscript.html\?id=/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1] - 5,
getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
}, {
name: 'Chrome Extension',
detector: /at MARKER \(chrome-extension:/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
}, {
name: 'Edge Console',
detector: /at MARKER \(eval/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(eval)/gm),
}, {
name: 'Edge Tampermonkey',
detector: /at MARKER \(Function/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1] - 4,
getCallers: (e) => e.stack.match(/[^ ]+(?= \(Function)/gm),
}, {
name: 'Safari',
detector: /^MARKER$/m,
getLine: (e) => 0,/*e.lineが用意されているが最終呼び出し位置のみ*/
getCallers: (e) => e.stack.split('\n'),
}, {
name: 'Default',
detector: /./,
getLine: (e) => 0,
getCallers: (e) => [],
}];
log.format = log.formats.find(function MARKER(f){
if(!f.detector.test(new Error().stack)) return false;
//console.log('////', f.name, 'wants', 0/*line*/, '\n' + new Error().stack);
return true;
});
core.initialize();
if(console.timeEnd) console.timeEnd(SCRIPTID);
})();