There is a known issue, where the graph is keeping serialized every editor frame in very certain cases and that is what is most than probably cause the lag you are experiencing.
Specifically, if the DialogueTreeController or the DialogueTree Asset is selected and currently in view of the Unity inspector, Unity will keep calling serialize every frame (which I personally consider a Unity bug).
The solution to this (until proper fix), would be to please deselect the DialogueTreeController or the Dialogue Tree Asset when editing the graph, or simply select anything else other than those two.
Please let me know if that works for you, or if the lag persists after using the above workaround.
Thank you.
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