Reduce Browser's Energy Impact for playing YouTube Video
当前为
Inspired by kona's YouTube CPU Tamer
This is for all kinds of YouTube applications, including main page, embedded video, live chat, and YouTube Music.
- Faster
- More Stable
- Lower Battery Consumption
Note1: This hijacks Web APIs: setTimeout, setInterval, clearTimeout, and clearInterval
Note2: This uses setInterval(..., 250ms) instead of requestAnimationFrame for background running.
Note3: If Timer Throttling2 occurs in background running, the interval would be increased, say 1000ms.
nextAt if(o.nextAt + _interval > now) o.nextAt += _interval; else if(o.nextAt + 2*_interval > now) o.nextAt += 2*_interval; else if(o.nextAt + 3*_interval > now) o.nextAt += 3*_interval; else if(o.nextAt + 4*_interval > now) o.nextAt += 4*_interval; else if(o.nextAt + 5*_interval > now) o.nextAt += 5*_interval; else o.nextAt = now + _interval;
o.nextAt = now + _interval for now >= o.nextAt + 5*_interval o.nextAt = now + _interval >= ( o.nextAt + 5*_interval ) + _interval o.nextAt = o.nextAt + 6*_interval t1 >= t0 + 6*T t1 - t0 >= 6T t1 - t0 <= 1000 (Timer Throtting) 1000 >= 6T T <= 1000/6 = 166.7 ms o.nextAt = now + _interval mostly for _interval < 167ms for background running with timer throtting
This userscript hijacks setTimeout & setInterval leading different browser behaviors as follows:
let baseDT = Date.now()-999999
let f1a=function(){console.log(Date.now()-baseDT, 'hello world f1a')};
let f1b=function(){console.log(Date.now()-baseDT, 'hello world f1b')};
let f1c=function(){console.log(Date.now()-baseDT, 'hello world f1c')};
setTimeout(f1a,100);setTimeout(f1a,100);setTimeout(f1a,100);
setTimeout(f1b,100);setTimeout(f1b,110);setTimeout(f1b,120);
setTimeout(f1c,100);setTimeout(f1c,200);setTimeout(f1c,300);
clearInterval(window.f1sA); clearInterval(window.f2sA);
let [f2a1,f2a2]=(()=>{let w1=0,w2=0;let f1 = ()=>{w1++}, f2= ()=>{w2++}; setTimeout(()=>{console.log(Date.now()-baseDT, '2A' ,w1,w2);},3000); return [f1, f2]; })();
window.f1sA=setInterval(f2a1,70); window.f2sA=setInterval(f2a2, 140);
clearInterval(window.f1sB); clearInterval(window.f2sB);
let [f2b1,f2b2]=(()=>{let w1=0,w2=0;let f1 = ()=>{w1++}, f2= ()=>{w2++}; setTimeout(()=>{console.log(Date.now()-baseDT, '2B', w1,w2);},3000); return [f1, f2]; })();
window.f1sA=setInterval(f2a1,5); window.f2sA=setInterval(f2a2, 10);
| Exceute the code while playing | Execute the code with paused video |
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| Exceute the code while playing | Execute the code with paused video |
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What Happens to setTimeout() / setInterval() Timers Running on Inactive Browser Tabs ?
Heavy throttling of chained JS timers beginning in Chrome 88