I have a DataSet with 4 tables and also it has relation for each table like this:

Table1
- Table2
- Table3
-Table4

Each of this table is bounded to a ComboBox, when i select an item from the first combo, the rest of the combos are filtered.

I click the menu option and My problem is that the form take more than 5 seconds to load, i don't my users will like that.

If i remove the DataSource from the Combo, the form is show in less than 2 seconds, i could live with that.

I Also realize that if i only bind to the first 2 comboboxes, the speed is not affected, but when i bind the 3 combobox the form slow down.

What can i do to avoid this?

Why DataBinding in .NET is so slow, always when i show a form with databinding takes more than a second to be show, in real applications this doesn't have on normal forms.

If I unbind my controls my form is shown inmediately.

Didn't the Microsoft Developers test this?

I feel like .NET has slow down things talking about UI.

If i make a control to change its appereance like a flat textbox with a border color, it is grayed when the form is loaded and the is drawn, this things doesn't look good.