Kant on Spinoza: Transcendental Realism

Kant talks about Spinoza in several places, though notably not in the first Critique. I think there are good reasons to suspect that he did not take Spinoza particularly seriously until after 1781, and that in the Critique of Pure Reason Leibniz serves as the more important representative of dogmatic and rationalist metaphysics. But in the second and third Critiques and the Lectures on Metaphysics, Spinoza comes up at some key moments.