analogWrite slow?

I use function() instead of ()=>, because it doesn't work in my browser.
And to stop analogWrite, use digatalRead.

// sinus.js

//setInterval( ()=> {analogWrite(D2, (Math.sin(getTime()) / 2.01) + 0.5 );},10);


//setInterval( function() {analogWrite(D2, (Math.sin(getTime()) / 2.001) + 0.5 );},10);

analogWrite(D2, 0.5, {freq:1000});

//setTimeout(function() {analogWrite(D2, 0);},1700);

setTimeout(function() {digitalRead(D2);},10);