javascript – How to smooth sprites on a web canvas?

I'm building a simple online 2D game. And I use canvas, but my sprites do not move softly enough.

Code: https://github.com/antonmedv/bit-biplanes

Demo: https://medv.io/bit-planes/

Sometimes the movement looks smooth, others do not.

j & # 39; uses requestAnimationFrame. Each image is less than 16ms and the FPS indicators show 60. But the movements are not smooth.

How to smooth sprites on the web?