Optimize ListView items which update frequently

gistfile1.java

public View getView(int position, View convertView, ViewGroup parent) {
    // check convertView, inflate new layout, obtain ViewHolder, get data item, etc.

    ViewHolder holder = ... ;

    Data item = getItem(position);

    if (holder.item != item) {
        holder.item = item;

        holder.titleView.setText(item.title);
        holder.openTimeView.setText(item.openTime);
    }

    holder.ratingView.setText(item.rating);
    holder.discountView.setText(item.discount);
}

public class Data {
    // these two fields will never change
    String title;
    String openTime;

    // these fields will change frequently
    String rating;
    String discount;
}

public class ViewHolder {
    TextView titleView;
    TextView openTimeView;
    TextView ratingView;
    TextView discountView;
    Data item;
}