运行新版本 iOS 的 iPhone 包含电源管理功能(power management feature)，可防止它们意外关机。它被称为峰值性能能力，(Peak Performance Capability,)如果电池在各种任务期间无法提供所需的电量，它会自动启用。如果您想了解iPhone 上的Peak Performance Capability是什么，以及如何禁用它，即使不推荐，请阅读这篇文章：
什么是iPhone的峰值性能能力？(Performance Capability)
峰值性能能力(Peak Performance Capability)是运行 iOS 11.3 或更高版本的 iPhone 的一项功能，允许它们控制性能限制(performance throttling)。即使 iPhone 必须执行要求苛刻的任务，它也能提供足够的电量。
如果您的 iPhone 电池无法为其某些组件提供足够的电力，例如其处理器 ( CPU ) 或图形芯片 ( GPU )，您会遇到意外关机。这可能是由于多种因素造成的，包括但不限于电池电量(battery charge)低、电池化学老化或低温。
当您的 iPhone 意外关机时，iOS 会自动启用Peak Performance Capability。此功能在您的 iPhone 上应用性能管理(performance management)，这意味着 iOS 开始动态管理CPU、GPU和其他组件的最大性能，以便它们消耗的电量不会超过电池所能提供的电量。换句话说，您的 iPhone 不应再意外关闭，但在某些情况下它也会变慢。
如果您的 iPhone 上启用了峰值性能功能(Peak Performance Capability)，您可能会注意到：
- 应用程序(Apps)的启动时间往往更长
- 某些应用程序和滚动时的帧速率较低
- 屏幕背光变暗
- 扬声器音量降低
- 相机闪光灯可能被禁用
- 您可能需要重新启动在打开它们时在后台刷新的应用程序
即使您的 iPhone 上启用了峰值性能功能(Peak Performance Capability)，它也不会对以下功能产生任何影响：
- 蜂窝通话质量(call quality)和网络吞吐量性能(throughput performance)
- 照片和视频质量
- GPS 性能和定位精度(GPS performance and location accuracy)
- 陀螺仪、加速度计、气压计等传感器
- 苹果支付
请记住，Peak Performance Capability仅适用于运行 iOS 11.3 或更高版本的 iPhone（而不是 iPad）。
一些用户可能不希望在他们的 iPhone 上启用性能限制。(performance throttling)这就是为什么我们将向您展示如何禁用它。但是请注意，这可能会导致新的意外关机，在这种情况下，您的 iPhone 会自动再次启用峰值性能功能。(Peak Performance Capability)
如何在 iPhone 上禁用峰值性能功能(Peak Performance Capability)
在 iPhone 的主屏幕上，点击设置(Settings)。
在“设置”(Settings)中，滚动直到找到“电池(Battery)”条目并点击它。
在电池(Battery)屏幕上，找到电池健康(Battery Health)并点击它。
现在，在Battery Health屏幕的底部，您应该会看到Peak Performance Capability部分。如果您的 iPhone 过去已经意外关机，则此功能已自动启用。
iOS 还应显示类似于以下屏幕截图中的消息：“由于电池无法提供必要的峰值功率，此 iPhone 意外关机。已应用性能管理来帮助防止这种情况再次发生。” ("This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again.")在消息的末尾，有一个名为Disable的链接（按钮） 。点击它可以禁用峰值性能功能(Peak Performance Capability)。
您的 iPhone 现在会警告您“禁用可能会导致意外关机”("Disabling May Lead To Unexpected Shutdowns")。如果您仍想这样做，请按Disable。否则，请点击保持开启(Leave On)。
禁用Peak Performance Capability后， (Peak Performance Capability)Battery Health页面上显示的消息也会更改为“此 iPhone 意外关机，因为电池无法提供必要的峰值功率。您已手动禁用性能管理保护”("This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. You have manually disabled performance management protections") .
这就对了！但是，请不要忘记，如果您的 iPhone 再次意外关机，峰值性能功能(Peak Performance Capability)会再次自动启用。
你的iPhone 会限制性能(iPhone throttle performance)吗？
您的电池是否处于原始状态，或者您的 iPhone 是否自动启用了峰值性能功能(Peak Performance Capability)？如果有，您是否更换了电池，或者您是否选择禁用性能限制，即使您冒着其他意外关机的风险？您是否喜欢Apple(Apple)在最新版本的 iPhone 版 iOS 中包含此功能的事实？
What is and how to disable Peak Performance Capability on iPhones
The iPhоnеs that are running new versions of іOS include a power management fеature that protects them from shutting down unexpectedly. It is called Peak Performance Capability, and it is automatically enabled if the battery cannot deliver the required amount of power during various tasks. If you want to learn about what Peak Performance Capability is on your iPhone, and how to disable it, even if it is not recommended, read this article:
What is Peak Performance Capability for iPhone?
Peak Performance Capability is a feature of iPhones running iOS 11.3 or newer, that allows them to control the performance throttling. It is the ability of your iPhone to provide enough power even when it has to perform demanding tasks.
If your iPhone's battery cannot supply enough power to some of its components, such as its processor (CPU) or graphics chip (GPU), you experience an unexpected shutdown. This can happen due to a multitude of factors including but not limited to a low battery charge, chemically aged battery or cold temperatures.
When your iPhone shuts down unexpectedly, iOS automatically enables Peak Performance Capability. This feature applies performance management on your iPhone, meaning that iOS starts to dynamically manage the maximum performance of the CPU, GPU, and other components so that they do not draw more power than the battery can deliver. In other words, your iPhone should no longer shut down unexpectedly, but it is also going to be slower in certain situations.
If Peak Performance Capability was enabled on your iPhone, you might notice that:
- Apps tend to have longer launching times
- Frame rates are lower in some apps and when scrolling
- Screen backlight is dimmed
- Speaker volume is lowered
- The camera flash might be disabled
- You may have to relaunch apps that refresh in the background when you open them
Even if Peak Performance Capability has been enabled on your iPhone, it does not have any effect on the following features:
- Cellular call quality and networking throughput performance
- The photo and video quality
- GPS performance and location accuracy
- Sensors such as the gyroscope, accelerometer, barometer
- Apple Pay
Remember that the Peak Performance Capability is available only on iPhones (but not iPads) that run iOS 11.3 or newer.
Some users might not want the performance throttling to be enabled on their iPhones. That is why we are going to show you how to disable it. However, note that this can lead to new unexpected shutdowns, in which case the Peak Performance Capability is automatically enabled again by your iPhone.
How to disable Peak Performance Capability on your iPhone
On your iPhone's home screen, tap Settings.
In Settings, scroll until you find the Battery entry and tap on it.
On the Battery screen, locate Battery Health and tap on it.
Now, on the bottom of the Battery Health screen, you should see the Peak Performance Capability section. If your iPhone has already shut down unexpectedly in the past, this feature has been automatically enabled.
iOS should also display a message similar to the one in the screenshot below: "This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again." At the end of the message, there is a link (button) called Disable. Tap it to deactivate the Peak Performance Capability.
Your iPhone now warns you that "Disabling May Lead To Unexpected Shutdowns". If you still want to do that, press Disable. Otherwise, tap Leave On.
Once you disable the Peak Performance Capability, the message displayed on the Battery Health page changes too, into something like "This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. You have manually disabled performance management protections".
That is it! However, do not forget that, if your iPhone unexpectedly shuts down again, the Peak Performance Capability was automatically enabled again.
Does your iPhone throttle performance?
Is your battery in pristine condition, or has your iPhone automatically enable the Peak Performance Capability? If it has, did you change your battery or did you choose to disable the performance throttling even if you risked other unexpected shutdowns? Do you like the fact that Apple included this feature in the latest versions of iOS for iPhones?
