Back button takes too long to go back - Possible reasons?

So I have a menu screen activity which calls other activities like so

option = new Intent(getApplicationContext(), OptionsScreen.class);  

...  

startActivity(option);

This options screen so far does nothing. more specifically, it is:

public class OptionsScreen extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
  开发者_C百科  // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.options);
    Toast.makeText(OptionsScreen.this, "options", Toast.LENGTH_SHORT).show();
}

And that's the whole activity for now. I call other Activities in a similar way. When I hit back it consistently takes 5 seconds to go back to the menu screen. This should not take this long since the OnResume() does nothing but set up onclick listeners. edit: On the MOTODEV emulators it freezes (might be a different problem) and on the basic android emulator it runs the same way as on the phone (5 second delay).

possibly relevant - When the menu screen is first called it plays a 5 second video, then uses a ViewSwitcher to go to the menu. that video only plays when the app first runs.

What are some possible reasons for this delay? Any ideas would be much appreciated.

EDIT: the following is the code from the OnCreate() function which plays the video. I actually removed it and it did not fix the delay, but I'll post it anyway.

VideoView logo;
...

logo.setVideoURI(Uri.parse("android.resource://COM.PRACTICE/" + R.raw.logoanimation2));
    logo.requestFocus();
    logo.start();
    logo.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        public void onCompletion(MediaPlayer mp) {
            // TODO Auto-generated method stub
            mHandler.removeCallbacks(UpdateTimeTask);
            mSwitcher = (ViewSwitcher) findViewById(R.id.viewSwitcherMenu);
            mSwitcher.showNext();
            menushown = true;
            logo.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                };
            });
        }
    });

EDIT: ok, so When I put "mSwitcher.showNext();" at the beginning of OnResume, it goes back with no delay, and plays the video again. I guess there is something I need to do to instantly show the correct view in the viewSwitcher? Anyone know what that is?

EDIT: I partially solved this problem. The delay is gone for 2/3 of the activities I launch from it. I did this in an odd way and I would still like to understand it better. I added the following code to the Onresume():

if (menushown) {mSwitcher.showNext(); mHandler.postDelayed(ViewSwitcherTask, 100);}

and then add this to the Activity Class:

Runnable ViewSwitcherTask = new Runnable() {
    public void run() {
       mSwitcher.showNext();
    }
 };

Simply calling showNext() twice did not work, and neither did anything else i tried. This is obviously not the ideal solution. Why would it work on 2/3 of my screens? Does anyone know why I had to do this? What is a better way to fix this delay?

EDIT: I simply removed the videoview from the view switcher after it plays. Fixed the problem completely.