The Court's skepticism of New Kent's freedom of choice plan was due in part to the county's slowness: "it is relevant that this first step did not come until some 11 years after Brown I was decided and 10 years after Brown II directed the making of a 'prompt and reasonable start.' ... Moreover, a plan that, at this late date, fails to provide meaningful assurance of prompt and effective disestablishment of a dual system is also intolerable. 'The time for mere 'deliberate speed' has run out,' Griffin v. County School Board, 377 U. S. 218, 377 U. S. 234."