How to increase the movement speed of an object?

Question

Canvas

const moveEndlessly = () => {
   ctx.fillStyle = "#000";
   ctx.fillRect(0, 0, canvas.width, canvas.height);
   ctx.fillStyle = "#59982f";
   ctx.fillRect(x--, y, w, 20);
 };
 window.requestAnimationFrame(moveEndlessly);

Answer 1

...
ctx.fillStyle = "#59982f";
x-=10;
ctx.fillRect(x, y, w, 20);
...