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The efficiency problem becomes obvious when you consider a user who accesses a website site many times. For example, imagine using an anonymous credential to replace Google’s session cookies. For most users, this require obtaining and delivering thousands of single-use credentials every single day. You might mitigate this problem by using credentials only for the first registration to a website, after which you can trade your credential for a pseudonym (such as a random username or a normal session cookie) for later accesses. But the downside of this is that all of your subsequent site accesses would be linkable, which is a bit of a privacy tradeoff.
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在苹果官网公布的技术规格中，新款iPad Air搭载的M4芯片在CPU和GPU核心配置上均与iPad Pro版本不同。iPad Air使用的是一颗八核CPU，包含三个性能核心和五个能效核心，并配备九核GPU。相比之下，此前的M4 iPad Pro提供两种配置：256GB和512GB机型采用九核CPU（三个性能核加六个能效核），而1TB和2TB机型则升级为十核CPU（四个性能核加六个能效核），所有版本均为十核GPU。这意味着iPad Air版本的M4在CPU能效核心和GPU核心数量上均有所削减，多任务和图形渲染时可用的硬件资源更少。