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Performance problem with combobox

hi,

I have a single combobox in a page.
The combo is created from an existing select element:
<script>
var z=dhtmlXComboFromSelect("workers");                        
z.enableFilteringMode(true);
</script>

I see with about 5000 options the combo works very slow - until the screen appears and after choosing a value (the filtering itself
works ok)..

What can I do to improve the performance ?

Thanks

Combo can work in "suggest" mode, when options loaded dynamically from server side. In such case you will not need to have all options on client side , which allow fast init. 
http://dhtmlx.com/docs/products/dhtmlxCombo/samples/filtering/100000/