We encounter massive performance issues while persisting and restoring the XamGrid with large data. We want to specifiy the persisted properties, because on the one hand the stored byte-array is too large and on the other hand it might improve the performance of the restoring-process. At the moment this are our PersistenceSettings:

_settings = new PersistenceSettings
{
SavePersistenceOptions = PersistenceOption.OnlySpecified,
LoadPersistenceOptions = PersistenceOption.OnlySpecified
};
_settings.PropertySettings.Add(new PropertyNamePersistenceInfo
{
PropertyName = "Columns",
Options = PropertyNamePersistenceOptions.PropertyName
});
_settings.PropertySettings.Add(new PropertyNamePersistenceInfo
{
PropertyName = "GroupByColumns",
Options = PropertyNamePersistenceOptions.PropertyName
});
_settings.PropertySettings.Add(new PropertyNamePersistenceInfo
{
PropertyName = "SortedColumns",
Options = PropertyNamePersistenceOptions.PropertyName
});

In general we want to store the FilterRow, GroupedBy, ColumnPosition, ColumnWidth, HiddenColumns, SortedColumns.  My question is for example: Do I really have to store the whole property "GroupByColumns" to know which columns where grouped? Same for the other properties.

I've attached a solution where you can reproduce the issue. Just play arround with Save and Load....