Grid containing page frozen for 8 seconds until scrollbar painted
I am experiencing very long unavailability times with some grids. The page page with grid an everything is loaded within 1200 milli seconds but then the page is frozen until the scrollbar of the grid is finally painted.
The grid has around 40 rows and 10 columns. I have special coloring for some rows, multi line headers, alternating colors of standard rows. The grid has no horizontal scrollbar. The grid height is limited to a 1024 x 768 resolution, about 50% of the rows are visible.
During the page paint I noticed a peek in CPU usage that drops immediately once the scrollbar is available.
The scrollbar is needed because one of the requirements is a fixed column header that is visible all the time.
I really would like to know what I can do to improve the speed of page interaction availability. Right now our clients refuse to accept the pages with such a long "load" time.