Hello, 

My webgrid is working in 2 main modes: flat & grouped.

Under some circumstances, the amount of rows I may encounter for flat mode can reach 50,000 rows.
For grouped mode: 10-15 groups with 4,000-11,000 rows for each group.

I'm using the following settings for the flat mode:
PagingMode = VirtualLoad, VirtualLoadMode = LargeData, VirtualPageSize = 2000
This helps my system to keep working without browser crashes.

On the other hand, using these settings for grouped mode does not seem to work well:
I'm unable to VirtualLoad (load more data) when coloumns are grouped. 
That's why i'm using the following settings:
PagingMode = None

This causes slow performance and browser crashes.

Please advise what would be the best practice when facing these amount of rows.

Thanks