Android : Faster way to parse a JSON String in android

I'm using this method to parse a JSON string, but it is too slow... is there a better way to do it? Thanks

synchronized private void parseCategories(String response){

    try{
        JSONArray categoriesJSONArray = new JSONArray (response);


        // looping through All Contacts
        for(int i = 0; i < categoriesJSONArray.length(); i++){
            JSONObject currentCategory = categoriesJSONArray.getJSONObject(i);

            String label="";
            String categoryId="";


            // Storing each json item in variable
            if(currentCategory.has("label"))
                label = currentCategory.getString("label");


            if(currentCategory.has("id"))
                categoryId = currentCategory.getString("id");

            if(
               label!=null &&
               categoryId!=null
              )
            {
                Category toAdd = new Category(categoryId, label);
                categories.add(toAdd);
            }

        }

        //Alphabetic order
        Collections.sort(
                categories,
                new Comparator<Feed>() {
                    public int compare(Feed lhs, Feed rhs) {
                        return lhs.getTitle().compareTo(rhs.getTitle());
                    }
                }
        );

        Intent intent = new Intent("CategoriesLoaded");
        LocalBroadcastManager.getInstance(mAppContext).sendBroadcast(intent);


    }catch (JSONException e) {
        e.printStackTrace();
    }

}