how good filter infinite listviewitemcollection?

so i have listview an top border 1000 items. i need means filter equipment controlling textbox's textchanged event. i have formula works good smaller array equipment (~400), nonetheless i need re-display full list 1000 items, takes 4 seconds.

i am formulating new listviewitems each time. instead, i keep list full vigilant collection following supplement that. seems .add slight holding enlarged regardless. here small sample:

this.beginupdate();
foreach (listviewitem vigilant m_cacheditems)
{
    mylistview.add(item);
}
this.endupdate;

i have attempted wholly adding blank equipment (i.e., inadequacy between equipment now being displayed sum list items), nonetheless doesn't work either. there conditions there wholly vigilant now displayed, user clears textbox, i need arrangement whole list.

i am unequivocally means eeking opening out .net controls infinite illustration this, i don't unequivocally know improved proceed it. there any proceed around controlling .add() method, not, only e improved whole solution?