Hi Jason,
Thanks for your interest in Syncfusion Products.
1) Regarding the UpdateDisplayFrequency property, i have checked its working in the attached sample. It works fine as expected. The functionality of this property setting is to delay the update handled in grid.
2) The UseOldListChangedHandler optimization property setting will be suggested only if there are any incompatibility issue related to performance. It must be set to false which is by default.
3) You can make use of the optimization settings suggested in the attached sample which makes the grid to perform much better in case of large dataset. Also, you can refer to our browser samples under "Performance" section shipped with Syncfusion Dashboard where the use of optimization settings based on the data binded were illustrated.
4) It is possible to delay the sorting to be applied in grid by setting the current thread to sleep mode in SortedColumns.Changing event. It is implemented in the sample.
Sample:
http://help.syncfusion.com/support/samples/Grid.Windows/7.4.0.20/F92100.zipRegards,
Rajadurai