If you mean dhtmlxcombo - fastest way to load data - load it from XML
Also addOption command can process an array of options by single call
Instead of
combo.addOption(a,b);
combo.addOption(a,b);
combo.addOption(a,b);
It possible to use
combo.addOption([a,b],[a,b],[a,b]);
Combo supports dynamic loading mode ( suggest mode ) which allow to load data on demand - this may be the best approach for huge option lists.
dhtmlx.com/docs/products/dhtmlxC … ng/100000/