Some way to remove quality to enhance fps in phone?

Questions
1

Project in question: https://didisoftwares.ddns.net/music/test/index.html

I’m trying to run the project below on an Android SM-A022.

However, there seems to be no way to synchronize the rendering with the beat calculation on phone.
In the browser, everything works fine.

Any way to prioritize calculations before rendering?
this is my update function:

function update() {
    requestAnimationFrame(update);
    var delta = clock.getDelta();
    var elapsed = clock.getElapsedTime();
    if (delta && delta != null && control && typeof (control) != _UN) { //all controls are created
        control.update();
        audioTest(delta,elapsed); //audio beat check
        postprocess.update(delta, elapsed); //shader materials update      
        postprocess.render(); //render paint
    }
}
2

Since you’re doing postProcessing, I would guess you are “render bound” on slower devices. You may want to try setting renderer.setPixelRatio(1) on lower end devices.