Let me clarify...

Lets look at two methods:
  - updateAsteroidsPhysics()
  - drawAsteroids(Canvas canvas)
They both use getters instead of members, and asteroids[i] instead of
asteroid variable, the only difference between them, that drawAsteroids
(Canvas canvas) is also use canvas calls, and I think this is most
heavy part, becouse:

updateSpaceshipPhysics();
updateAsteroidsPhysics();
updateBulletsPhysics();
checkForCollisions();

takes ~1-5ms to perform, and:

drawSpaceship(canvas);
drawAsteroids(canvas);
drawBullets(canvas);

takes ~25ms to perform (and even more, if I increase number of
asteroids or start to fire bullets)
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