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I need to have undo+redo stack for a limited number of classes under my control that has to be very very very fast and using RTTI and XML or streams is not feasible as the count of instances can be as high as 2000+ in nested object lists. The objects need to be copied into and out of via memento pattern and reloaded instantly.
Is there a way to clone objects by copying the memory and re-instantiating the objects from that memory?
Hardly. You can easily copy the memory of an object, but part of that memory will be pointers in which case you only copy the reference. Those pointers can include strings and other objects as well.
I think the best way is to inherit these classes from TPersistent (or any decendant) en implement the Assign method for each of them. That way, you can create a second instance and assign the object to that new instance. In the Assign implementation you can decide for yourself what data should be copied and what not.