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grid is loading data from combo very slow in IE

For IE the grid is very slow and it often blocks, when I try to change data in the "co" cells. Is there a way to improve the behaviour. I don't have that problem in FireFox.

How much options you have in "co" cell?
Each time , when editor opened, select box element created on the fly, so if it contains a lot of options ( more than 100 I suppouse ) it may be slow 
For big count of options you can try to use "combo" column type ( dhtmlxcombo as editor of grid ) - it must work faster and have possibility of auto-filtering and dyn. loading of data which can be usefull in case of big options list. 

http://dhtmlx.com/docs/products/dhtmlxGrid/samples/interaction_other_components/pro_combo.html?un=1224149348000