Using the Notes C++ SDK, it takes almost four minutes to retrieve the calendar entries. I may have a slow connection, but the Notes client doesn't take even close to that long.
I am using the code from the schedule sample as such:
beginDate.SetDate(3, 29, 2010);
endDate.SetDate(3, 30, 2010);
this->calendarEntries = new LNCalendarEntryArray();
Stepping through, it is the call to calendar->GetEntries that is slow as molasses. It takes almost four minutes to return.