您是否一直注意到Mac(Mac)上有一个名为“nsurlsessiond”的进程占用大量CPU?这是什么,为什么会发生这种情况?你应该担心吗?
“Nsurlsessiond”是一个合法进程,但持续较高的CPU使用率可能会导致性能问题和电池寿命缩短。我们将深入探讨“nsurlsessiond”是什么,并向您展示减少其对 Mac CPU 的(CPU)影响的方法。

Nsurlsessiond 进程是什么?
Mac上的“nsurlsessiond”进程是Apple Foundation 框架内 NSURLSession API 的(NSURLSession API within Apple’s Foundation framework)组成部分,其主要作用是在后台管理网络操作。
当您在一个应用程序中启动下载或上传并转移到另一个应用程序时,“nsurlsessiond”将无缝管理该任务并防止其被中断。
例如,“nsurlsessiond”的一个显着功能是它对 iCloud 的参与。它可以在Mac(Mac)和 Apple 服务器之间同步照片、文档和其他数据。这意味着当您更新或添加文件到基于 iCloud 的应用程序时,“nsurlsessiond”会促进数据传输,即使应用程序未主动运行也是如此。
为什么 Nsurlsessiond 使用更多 CPU
由于“nsurlsessiond”负责处理 Mac 上各种应用程序的网络任务,(Mac)尤其是那些后台驱动的应用程序,因此该进程的高CPU使用率可能归因于大量持续下载、大量数据同步操作或特定应用程序启动的持续数据传输。应用。
但是,如果“nsurlsessiond”始终
使用大量CPU ,则表明存在其他原因,例如进程在尝试同步损坏的数据时卡住,或者行为不当的应用程序发出过多或错误的网络请求。(CPU)

与 macOS 更新相关的软件故障或错误也会导致“nsurlsessiond”的复杂化。与任何软件组件一样,此流程也无法避免编码疏忽带来的问题,这意味着与其他本机和第三方流程的冲突确实会发生。
如何减少高 Nsurlsessiond CPU(High Nsurlsessiond CPU)使用率
如果您在Mac 的活动监视器中发现“nsurlsessiond (Mac’s Activity Monitor)”CPU使用率较高,则应始终等待检查其是否消退。如果在合理的时间后仍未发生这种情况,您必须从根源上识别并解决问题。
对于初学者来说,这涉及强制退出“nsurlsessiond”、关闭和打开 iCloud,以及管理使用大量网络资源的应用程序。如果问题仍然存在,请更新 Mac 的系统软件并检查内部存储是否存在恶意软件。
停止(Stop All Instances)Nsurlsessiond的所有实例
最好先关闭Mac上的“nsurlsessiond” ,因为这通常可以解决导致进程失控的意外技术问题。
由于根据网络活动,“nsurlsessiond”进程往往有多个实例,因此最快的方法是使用macOS 中的终端控制台(Terminal console in macOS)运行特定命令。只是:
- 打开启动板(Launchpad)并选择其他 >终端(Terminal)。
- 输入以下命令并按回车键:
sudo Killall nsurlsessiond

- 输入 Mac 的管理员密码进行身份验证,然后再次按Return键。
重新启动你的Mac
重新启动 Mac 有很多好处(many benefits),包括解决 macOS 中的随机异常问题。因此,如果您注意到“nsurlsessiond”再次增加了CPU活动,您应该这样做。

要重新启动 macOS,请打开Apple菜单,选择重新启动(Restart),取消选中重新登录时重新打开(Reopen)窗口旁边的框,然后再次
选择重新启动。(Restart)
禁用和启用 iCloud
iCloud 服务(例如 iCloud Drive和照片)可能(Photos—can)会遇到同步问题,导致“nsurlsessiond”使用过多的CPU。您可以通过刷新与 iCloud 的连接来排除这种情况。就是这样:
- 打开Apple菜单并选择“系统设置”(System Settings)。
- 选择侧边栏上的 Apple ID。
- 向下滚动(Scroll)右侧窗格并选择“注销”(Sign Out)。

- 按照屏幕上的说明注销您的 Apple ID,您可以选择在本地下载您的 iCloud 数据,但这不是必需的,因为您很快就会重新登录。
- 重新启动Mac,重新打开“系统设置”(System Settings),然后选择“登录(Sign)”以重新登录。
(Troubleshoot)对网络密集型应用程序(Apps)进行故障排除
另一种故障排除技术是识别恶意或未优化的Mac应用程序,这些应用程序会因网络活动频繁而将“nsurlsessiond”推入超速状态。只是:
- 打开启动板(Launchpad)并选择其他 >活动监视器(Activity Monitor)。
- 切换到“网络”选项卡并使用(Network)“发送字节数(Sent Bytes)”和“接收字节数”(Rcvd Bytes)列对进程进行排序。
- 记(Note)下通过您的用户帐户生成的所有应用程序 - 检查列表顶部的
“用户”列。(User)

提示:另一种更直接的技术来查明具有高网络流量的应用程序是使用TripMode(TripMode)或Little Snitch等第三方监控工具。
完成此操作后,您可以执行以下几项操作来减少网络密集型应用程序对“nsurlsessiond”造成的影响。
- 暂停(Pause)和恢复活动(Resume Activity):打开应用程序的用户界面,然后暂停和恢复任何上传或下载。您还可以尝试退出并重新启动该应用程序。
- 更新应用程序:您可以通过 Mac 的App Store将 Mac 应用程序更新到最新版本(update a Mac application to its latest version)。如果您是从开发人员的网站获得的,请在应用程序中
查找“检查(Check)更新”选项。(Updates)
- 清除应用程序的缓存(Cache):打开Finder,选择菜单栏上的Go > Go~/Library/Caches目录。找到与应用程序相关的缓存文件夹并清空其内容。
- 删除(Remove)并重新安装(Reinstall)应用程序(App):访问应用程序(Applications)文件夹并将应用程序拖到废纸篓中(Trash)。然后,通过Mac App Store(Mac App Store)或开发者网站
重新安装应用程序。
或者,您可能希望阻止应用程序以及任何关联的启动代理和守护程序(block the app and any associated launch agents and daemons)在 Mac 启动时加载。
清除临时 Nsurlsessiond 数据
下一个修复涉及清除“nsurlsessiond”进程存储临时数据的目录。这可以解决缓存损坏引起的问题。要做到这一点:
- 打开终端。
- 运行以下命令,输入 Mac 的密码,然后按 Return 键:
sudo Killall -9 可信

- 接下来执行下面的命令:
ls -la /var/folders/zz |grep nsurlsessiond
- 在终端(Terminal)输出中,记下随机文件夹名称,例如 zyxvpxvq6csfxvn_n00000y800007k。

- 运行以下命令,将 [随机文件夹名称] 替换为您之前记下的内容:
sudo rm –fr /var/folders/zz [随机文件夹名称]

- 退出命令行并重新启动Mac。
更新您的 Mac
较新的(Newer)macOS 更新包含错误修复和性能增强,可解决“nsurlsessiond”等进程的已知问题。如果问题仍然存在,请将 macOS 更新到最新版本。就是这样:
- 打开Apple菜单并选择“系统设置”(System Settings)。
- 转至常规 > 软件更新。
- 如果有可用的新更新,
请选择“立即更新” 。(Update)

检查是否存在恶意软件
Mac(Macs)并非不受恶意软件的影响。如果“nsurlsessiond”继续造成问题,则可能表明存在恶意软件,例如,有害程序可能正在秘密地在线传输数据。
要解决这个问题,请下载并安装专为 Mac 设计的值得信赖的反恶意软件工具(trustworthy anti-malware tool designed for the Mac)。一个流行的选择是Malwarebytes 的免费版本(free version of Malwarebytes),它在解决严重感染方面非常有效。

安装后,打开反恶意软件实用程序并启动完整系统扫描以查找并删除威胁。
减少
高Nsurlsessiond CPU 使用率(Nsurlsessiond CPU Usage)
Mac上的“nsurlsessiond ”CPU使用率偶尔会出现激增,这是正常现象,但如果它持续占用资源,那就需要担心了。了解原因至关重要,系统地完成上述说明应该会有所帮助。
如果您想要执行其他故障排除,您可以在安全模式下重复相同的解决方案(repeat the same solutions in Safe Mode),重置 Mac 的网络设置(reset the Mac’s network settings),并清除系统软件缓存(clear the system software cache)。
How to Reduce “nsurlsessiond” High CPU Usage on Your Mac
Do you keep notіcing a process called “nsurlsessiond” using lots of CPU on your Mаc? What is it, and why doеs that haрpen? Should you be concernеd?
“Nsurlsessiond” is a legitimate process, but persistently high CPU usage can lead to performance hiccups and shorter battery life. We’ll dive into what “nsurlsessiond” is and show you ways to reduce its toll on the Mac’s CPU.

What Is the Nsurlsessiond Process?
The “nsurlsessiond” process on a Mac is integral to the NSURLSession API within Apple’s Foundation framework, and its primary role is to manage network operations in the background.
When you initiate a download or upload in one app and move to another, “nsurlsessiond” will seamlessly manage the task and prevent it from being interrupted.
For instance, a notable function of “nsurlsessiond” is its involvement in iCloud. It synchronizes photos, documents, and other data between the Mac and Apple’s servers. That means when you’re updating or adding files to an iCloud-based app, it’s “nsurlsessiond” that facilitates the data transfer, even when the app isn’t actively running.
Why Nsurlsessiond Uses More CPU
Since it’s “nsurlsessiond” that handles network tasks for various applications on the Mac, especially those that are background-driven, high CPU usage by this process could be attributed to large ongoing downloads, extensive data sync operations, or constant data transfers initiated by specific apps.
However, if “nsurlsessiond” uses lots of CPU all the time, that indicates other causes, such as the process getting stuck attempting to sync broken data or misbehaving applications making excessive or faulty network requests.

Software-related glitches or bugs related to macOS updates also lead to complications with “nsurlsessiond.” Like any software component, this process isn’t immune to issues from coding oversights, meaning conflicts with other native and third-party processes do occur.
How to Reduce High Nsurlsessiond CPU Usage
If you notice high “nsurlsessiond” CPU usage in the Mac’s Activity Monitor, you should always wait to check if it subsides. If that fails to happen after a reasonable amount of time, you must identify and troubleshoot the problem at its source.
For starters, that involves force-quitting “nsurlsessiond,” toggling iCloud off and on, and managing apps that use heavy network resources. If the problem persists, update the Mac’s system software and check the internal storage for malware.
Stop All Instances of Nsurlsessiond
It’s best to kick things off by shutting down “nsurlsessiond” on your Mac since that often resolves unexpected technical issues causing the process to go haywire.
Since there tend to be multiple instances of the “nsurlsessiond” process depending on network activity, the fastest way to do that is to run a specific command using the Terminal console in macOS. Just:
- Open the Launchpad and select Other > Terminal.
- Type the following command and press Return:
sudo killall nsurlsessiond

- Enter your Mac’s administrator password for authentication and press Return again.
Restart Your Mac
Restarting your Mac has many benefits, including resolving random anomalies in macOS. So, if you notice “nsurlsessiond” is ramping up CPU activity again, you should do just that.

To reboot macOS, open the Apple menu, select Restart, uncheck the box next to Reopen windows when logging back in, and select Restart again.
Disable and Enable iCloud
iCloud services—like iCloud Drive and Photos—can run into sync issues that result in “nsurlsessiond” using excessive CPU. You can rule that out by refreshing the connection with iCloud. Here’s how:
- Open the Apple menu and select System Settings.
- Choose Apple ID on the sidebar.
- Scroll down the right pane and select Sign Out.

- Follow the on-screen instructions to sign out of your Apple ID—you’ll have the option to download your iCloud data locally, but this isn’t necessary since you’ll shortly be signing back in.
- Restart your Mac, re-open System Settings, and select Sign In to sign back in.
Troubleshoot Network-Intensive Apps
Another troubleshooting technique is identifying rogue or unoptimized Mac applications that push “nsurlsessiond” into overdrive due to heavy network activity. Just:
- Open the Launchpad and select Other > Activity Monitor.
- Switch to the Network tab and sort the processes using the Sent Bytes and Rcvd Bytes columns.
- Note down any apps generated through your user account—check the User column—at the top of the list.

Tip: An alternative—and a much more straightforward—technique to pinpoint apps with high web traffic is to use a third-party monitoring tool like TripMode or Little Snitch.
Once you’ve done that, here are several things you can do to reduce the impact on “nsurlsessiond” caused by network-intensive apps.
- Pause and Resume Activity: Open the application’s user interface, and then pause and resume any uploads or downloads. You can also try to quit and relaunch the app.
- Update the App: You can update a Mac application to its latest version through the Mac’s App Store. If you got it from the developer’s website, look for a Check for Updates option within the application.
- Clear the App’s Cache: Open Finder, select Go > Go to Folder on the menu bar, and visit the ~/Library/Caches directory. Locate the cache folder related to the app and empty its contents.
- Remove and Reinstall the App: Visit the Applications folder and drag the app to the Trash. Then, reinstall the application via the Mac App Store or the developer’s website.
Optionally, you might want to block the app and any associated launch agents and daemons from loading at Mac startup.
Clear Temporary Nsurlsessiond Data
The next fix involves clearing the directory where the “nsurlsessiond” process stores temporary data. That could resolve problems stemming from cache corruption. To do that:
- Open Terminal.
- Run the following command, enter your Mac’s password, and press Return:
sudo killall -9 trustd

- Execute the command below next:
ls -la /var/folders/zz | grep nsurlsessiond
- In the Terminal output, note down the randomized folder name—e.g., zyxvpxvq6csfxvn_n00000y800007k.

- Run the following command, replacing [randomized folder name] with what you noted down earlier:
sudo rm –fr /var/folders/zz [randomized folder name]

- Exit the command line and restart your Mac.
Update Your Mac
Newer macOS updates contain bug fixes and performance enhancements that address known problems with processes like “nsurlsessiond.” If the problem persists, update macOS to its latest version. Here’s how:
- Open the Apple menu and select System Settings.
- Go to General > Software Update.
- Select Update Now if there’s a new update available.

Check for Malware
Macs aren’t impervious to malware. If “nsurlsessiond” continues to cause trouble, it could indicate the presence of malicious software—e.g., a harmful program might be stealthily transmitting data online.
To deal with that, download and install a trustworthy anti-malware tool designed for the Mac. A popular option is the free version of Malwarebytes, which is highly potent at resolving severe infections.

After installing, open the antimalware utility and initiate a full system scan to locate and remove threats.
High Nsurlsessiond CPU Usage Reduced
Occasional bursts in “nsurlsessiond” CPU usage on your Mac are expected, but if it’s consistently hogging resources, that’s a concern. Knowing why can be crucial, and systematically working through the above instructions should help.
In cases where you’d like to perform additional troubleshooting, you can repeat the same solutions in Safe Mode, reset the Mac’s network settings, and clear the system software cache.