why datagridview ComboBox Responses Slowly

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C#

combobox

DataGridView

i have combobox in datagridview and i have set it's datasource to a datatable which contains about 19K rows.

 DataGridViewComboBoxEditingControl cbo = e.Control as DataGridViewComboBoxEditingControl;

cbo.DropDownStyle= ComboBoxStyle.DropDown;
cbo.AutoCompleteSource = AutoCompleteSource.ListItems;
cbo.AutoCompleteMode = AutoCompleteMode.Suggest;
     
cbo.Validating += new CancelEventHandler(cbo_Validating);

when i first press any key then it takes about 20 seconds or more to show the key pressed and suggestion too.

Is there any good alternative to get quick response against keypress, so i can get suggestion within no seconds.