>My favourite candidate to look for when a grid is slow are the dynamic properties. If any of them is a method or function call, just try to make it a simple expression or comment out the code where you set it. I've seen incredible differences in speed when I replaced a method call which returned a rgb() for a dynamic backcolor with a field which contained that rgb value filled in advance. Keep in mind that for each refresh, each dynamic property gets evaluated for each visible cell.

I think your suggestion doesn't apply here. The hourglass I'm referring to appears when I click on the Header of the column. I do not use any dynamic properties for the grid at all (though I didn't check the parent class code closely). The cGrid grid behaves normally, while my grdSorting produces that weird behavior. I posted all the code in the begining of the thread. I made a small change to use a reference to last clicked header rather than clearing pictures in all headers. It didn't make a difference, may be even worsen the situation.