使用delta.

Gdx.graphics.getDeltaTime()方法返回自上一个渲染帧以来的秒数.通常，此值非常小，等于1/FPS.

Gdx.graphics.getDeltaTime() method return secods since last render frame. Usually this value is very small, and it equal 1 / FPS.

@Override
public void render() 
{
    // limit it with 1/60 sec
    float dt = Math.min(Gdx.graphics.getDeltaTime(), 1 / 60f); 
    // then move your characted according to dt
    player.pos = player.pos + player.speed * dt;
    // or, you could mute the speed like this:
    player.pos = player.pos + player.speed * dt * 0.85;
}