在处理精灵时减慢数组中的纹理变化

我正在用XNA 4.0用c#制作一个小游戏。我已经成功地让精灵朝各个方向移动，让它看起来像是在用数组行走。到目前为止，我只使用"向上"键进行了测试。问题是，当我按下向上键时，精灵移动了，但它通过数组中的所有元素的速度太快了，看起来他跑得太快了。有没有办法减慢纹理在彼此之间变化的速度，比如暂停方法之类的。任何一点帮助都是感激的，谢谢。

namespace RandomGame
{
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        Color backColor = Color.FromNonPremultiplied(190, 230, 248, 250);
        int i = 0;
        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            graphics.IsFullScreen = false;
            graphics.PreferredBackBufferHeight = 500;
            graphics.PreferredBackBufferWidth = 800;
            Content.RootDirectory = "Content";
        }

        protected override void Initialize()
        {
            base.Initialize();
        }
        Texture2D[] UpTextures = new Texture2D[6];
        Texture2D startTexture;
        Texture2D leftTexture;
        Texture2D rightTexture;
        Vector2 position = new Vector2(380, 230);
       protected override void LoadContent()
        {

            spriteBatch = new SpriteBatch(GraphicsDevice);
            startTexture = Content.Load<Texture2D>("BlueLinkStart");
            leftTexture = Content.Load<Texture2D>("BlueLinkLeft");
            rightTexture = Content.Load<Texture2D>("BlueLinkRight");
            UpTextures[0] = Content.Load<Texture2D>("BlueLinkUp");
            UpTextures[1] = Content.Load<Texture2D>("BlueLinkUp2");
            UpTextures[2] = Content.Load<Texture2D>("BlueLinkUp3");
            UpTextures[3] = Content.Load<Texture2D>("BlueLinkUp4");
            UpTextures[4] = Content.Load<Texture2D>("BlueLinkUp5");
            UpTextures[5] = Content.Load<Texture2D>("BlueLinkUp6");
        }
       protected override void UnloadContent()
        {
        }
       protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Escape))
            {
                this.Exit();
            }
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Left) && position.X > -3)
            {
                position.X -= 2;
            }
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Right) && position.X < 772)
            {
                position.X += 2;
            }
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Up) && position.Y > -3)
            {
                position.Y -= 2;
            }
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Down) && position.Y < 472)
            {
                position.Y += 2;
            }
            base.Update(gameTime);
        }
       protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.FromNonPremultiplied(188, 231, 241, 255));
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Left))
            {
                spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);
                spriteBatch.Draw(leftTexture, position, Color.White);
                spriteBatch.End();
                base.Draw(gameTime);
            }
            else if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Right))
            {
                spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);
                spriteBatch.Draw(rightTexture, position, Color.White);
                spriteBatch.End();
                base.Draw(gameTime);
            }
            else if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Up))
            {
                spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);
                spriteBatch.Draw(UpTextures[i], position, Color.White);
                spriteBatch.End();
                i++;
                if (i == 6) { i = 0; }
                base.Draw(gameTime);
            }
            else
            {
                spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);
                spriteBatch.Draw(startTexture, position, Color.White);
                spriteBatch.End();
                base.Draw(gameTime);
            }
        }
    }
}