How to speed up the populating of listview + filter Android

[User 9427106]

Hi, Android (C#) : I am populating my listview from Sqlite (sometime also from DataTable) 1. when the data is huge its very slow ? 2. how to have filter for this with high speed ?(same as contact list ) Thanks in advanced ! For filtering i have seen this code :

_adapter.Filter.InvokeFilter(_inputSearch.Text);

but just work for one column :

_adapter = new ArrayAdapter<string>(this, Resource.Layout.list_item, Resource.Id.product_name, products);

No USE At ALL !!!! my code :

protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);

        // Create your application here
        SetContentView(Resource.Layout.HesabList);

        progress = ProgressDialog.Show(this, "", "Loading ...");
        progress.SetProgressStyle(ProgressDialogStyle.Spinner);
        progress.Indeterminate = true;
        new Thread(new ThreadStart(delegate
        {
            \_btnUpdate = FindViewById<Button>(Resource.Id.UpdateHesabList);
            \_btnUpdate.Click += new EventHandler(\_btnUpdate\_Click);
            gvHesab = FindViewById<ListView>(Resource.Id.gvHesabList);
            gvHesab.ItemClick += new EventHandler<AdapterView.ItemClickEventArgs>(gvHesab\_ItemClick);
            isTarafHesab = Intent.GetBooleanExtra("IsTarafHesab", false);
            txtSearchHesabList = (EditText)FindViewById(Resource.Id.txtSearchHesabList);
            txtSearchHesabList.TextChanged += new EventHandler<Android.Text.TextChangedEventArgs>(txtSearchHesabList\_TextChanged);
            txtSearchHesabList.Gravity = GravityFlags.Right;

            Looper.Prepare();
            File dbtest = new File(clsBase.SqliteDBPath);
            
            if (!dbtest.Exists() )
            {

                if (clsBase.HasInternetConnection(this))
                    createDbSqlite();
                else
                {
                    MessageBoxAndroid.Show(this, "Connect to Internet First !");
                    Finish();
                }
            }
            else
            {
                 fillListView();
             }

            RunOnUiThread(() => progress.Dismiss()); 
       })).Start();
        
    }

private void fillGridView()
{
try
{
SQLiteDatabase db = OpenOrCrea