Picasso: Already downloaded images disappear while scrolling upwards in listview, loads slowly

Hi everyone,

My listview loads Picasso images slowly. I often have wait on it to download one image, scroll a bit, and wait on it to download the next image in the listview, it doesn't work in advance.

Downloaded images also disappear when I scroll back up. It feels as if Picasso is only loading 4-5 images at a time and replacing the ones already loaded to make room. Here's (http://i.imgur.com/SvzGWLI.png) what my memory looks like right now as I scroll up and down and wait for images to load.

public class MainActivity extends Activity {
    private List<Post> myPosts = new ArrayList<Post>();
    protected String[] mBlogPostTitles;
    public static final String TAG = MainActivity.class.getSimpleName();

    ...

    private void populateListView() {
        Activity activity = MainActivity.this;

        ArrayAdapter<Post> adapter = new MyListAdapter();
        ListView list = (ListView) findViewById(R.id.postsListView);
        list.setAdapter(adapter);
        list.setOnScrollListener(new SampleScrollListener(activity));
    }

    private class MyListAdapter extends ArrayAdapter<Post>{
        public MyListAdapter() {
            super(MainActivity.this, R.layout.item_view, myPosts);
        }

        @Override
        public int getViewTypeCount() {
            return 2;
        }

        @Override
        public int getItemViewType(int position) {
            String imageURL = myPosts.get(position).getImage();
            if(imageURL == null || imageURL.isEmpty()){
                return 1; // text based
            }else{
                return 0; // image based
            }
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            PostViewHolder holder;

            int type = getItemViewType(position);

            View itemView = convertView;

            // make sure we have a view to work with
            if (itemView == null) {
                holder = new PostViewHolder();
                if(type == 1) {
                    itemView = getLayoutInflater().inflate(R.layout.item_view, parent, false);
                }else {
                    itemView = getLayoutInflater().inflate(R.layout.image_post_view, parent, false);
                    holder.image = (ImageView) itemView.findViewById(R.id.item_image);
                }
                holder.user = (TextView) itemView.findViewById(R.id.item_txtUser);
                holder.time = (TextView) itemView.findViewById(R.id.item_txtTime);
                holder.post = (TextView) itemView.findViewById(R.id.item_txtPost);
                holder.likes = (TextView) itemView.findViewById(R.id.item_txtLikes);

                itemView.setTag(holder);
            } else {
                holder = (PostViewHolder) itemView.getTag();
            }

            //find the post to work with
            Post currentPost = myPosts.get(position);

            if(type != 1) {
                Context context = itemView.getContext();
                String imageURL = currentPost.getImage();

                Picasso.with(context).setIndicatorsEnabled(true);
                //Picasso.with(context).setLoggingEnabled(true);
                Picasso.with(context)
                        .load(imageURL)
                        .tag(context)
                        .placeholder(R.drawable.kanye8080s)
                        //.skipMemoryCache()
                        .error(R.drawable.stadiumarcadium)
                        .fit()
                        .into(holder.image);
            }
            //Username
            holder.user.setText(currentPost.getUser());

            //Time of post
            holder.time.setText("" + currentPost.getTime());

            //The actual post
            holder.post.setText(currentPost.getPost());

            //Likes for the post
            holder.likes.setText("" + currentPost.getLikes());

            return itemView;
        }
    }
    public class SampleScrollListener implements AbsListView.OnScrollListener {
        private final Context context;

        public SampleScrollListener(Context context) {
            this.context = context;
        }

        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) {
            final Picasso picasso = Picasso.with(context);
            if (scrollState == SCROLL_STATE_IDLE || scrollState == SCROLL_STATE_TOUCH_SCROLL) {
                picasso.resumeTag(context);
            } else {
                picasso.pauseTag(context);
            }
        }

        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
                             int totalItemCount) {
            // Do nothing.
        }
    }


    ...
} 

I have already posted this concern on SO (http://stackoverflow.com/questions/27771646/picasso-keeps-reloading-images-while-scrolling-upwards-in-listview-loads-slowly) but was unable to find a solution. I was wondering if you guys, as a last resort, could help me figure it out? I am already using the fit() call, so I don't think it's a resizing issue. Any help would be greatly appreciated, thanks!