Gridview and autopostback control

[Ben]

I have one Gridview and one checkbox control in the same page.
Click the checkbox will just hide or show a calendar contral.
It will take about one minutes for gridview to databind because of long
sql query.

Here is my question:
Because Gridview databind is in the page_load function, a checkbox
click will take about 1 minutes to load the page.

Is there a way to speed this up?

Thanks,

Ben