Is there any sort of progress events for filtering? I have a full enumeration provider that implements IFilteredSimpleSyncProvider, ISupportFilteredSync, but the progress appears to hang because there are no indications that it is filtering out data, then there is a big jump once it starts updating records.
not exactly what you needed for events fired by filtering, but you can try configuring the DestinationCallbacks on the provider for reporting progress, specifically the ProgressChanged event.