Data disappearing during vertical scroll in Grid for huge dataset

Hi,

My data in grid is displayed correctly when I have less than 200 rows. But when I exceed that limit and try to scroll vertically the data in the grid disappears and appears after couple of seconds. It happens everytime I use scroll. The free flow of data is lost and have to wait for page to refresh.

I would appreciate if any suggestion in this regards is provided.

Thanks & Kind Regards,
Jameel.

Please provide more info:

Are you using setVirtualMode(true) ?
How many columns?
Also happens when using pag-down key? and/or arrow-down key?

OS and Browser ( version)
AW version

Thanks

Thanks for your reply.

Grid virtual mode is turned on after 200 rows.
Columns: 6
Yes its happening on pa-down, arron-down and mouse scroll.

OS: XP
Browser : IE 6 & FF 2
AW: 2

Thanks,
Jameel.

Also I wanted to know the disadvantages or impact if I increase the Virtual Threshold as I feel increasing it would fix my issue?

Thanks,
Jameel.

Thanks Jameel,
Well, pre-fetching rows in virtual mode could help ( you need to do some tests on it), but in general I think re-rendering on scroll depends on some other factors.
- xlm data model is slower than csv or array.
- AW Versions above 253 are much slower rendering when using large number of columns and/or many visible columns.
- Large Visible number of rows also counts.
( last 2 factors can be easy demostrated by increasing grd sizes in the above virtual sample) .. i.e obj.setSize(700, 850);
- Strong formated columns could increase time also.
HTH