Paginate a custom sublist

Hi, I have a  performance problem with a suitlet script that I`m doing. I just want to view the results of a search in a sublist, but generaly the results are more than 800 lines, so when the proces is painting the sublist at the end my sublist only have around 80 and 100 lines.

This is the code:

var form = nlapiCreateForm('Orden de Compra Masiva');
var sublist = form.addSubList('custpage_sublist', 'list', 'Editor');

And this is the search

function getBackOrderedItems(location, clase, currency)
{
  var index = -1;
  var filters = new Array();
  filters[index++] = new nlobjSearchFilter ('mainline', null, 'is', 'F' );
  filters[index++] = new nlobjSearchFilter ('quantitybackordered', 'item', 'greaterthan', 0);