In LINQ 2 SP we work with a data context. By default a data context has the property ObjectTrackingEnabled = true. This property is crucial for all other operations in CRUD except Read. I performed a mini experiment. I created 20 000 items in my task list. Every seventh item contains “pärla”. Allright, here is what I found out: 2857 / 20 000 items ObjectTrackingEnabled = true 07s.405ms ObjectTrackingEnabled = false