var radWindow = GetRadWindowManager().GetWindowByName( 'rwAddItem');
I have the RadWindow control set to ReloadOnShow = false and , so it isn't attempting to reload the page again when I show it. I've also set ShowContentDuringLoad to true on the RadWindow control. Both have provided no improvement.
When the parent's gridView has a small amount of data it shows just fine. But in cases where I have many more rows in the grid, and I click the button to show the radwindow, it is VERY VERY SLOW. But since i'm doing this all client-side, no server side postbacks, shouldn't this all be relatively quick.
The contents of the window, when loaded in a standard browser window load just fine, so I just don't understand why it would load so slowly based on teh content of the parent page.