How is the performance for CoreData and what are the general performance guidelines? How many core data calls can be made before the it starts impacting performance and usability? I understand that this depends on various factors like schema, number of rows etc. But are there any recommended best practices?How is the performance for CoreData and what ar
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iOS：在显示屏幕变得明显之前，可以进行多少次核心数据调用？
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