Microsoft Cross machine Service high CPU usage is a widespread bug in the latest Windows 11 build.
Even after restarting the computer, the Microsoft Cross gear Service high CPU usage problem will reappear.
Fortunately, users from various forums who have faced this issue have discovered several successful methods.

We have compiled and provided a list of these solutions for you to attempt sequentially.
What is Windows X-Lite Optimum 11 24H2?
How to get this system downloaded and installed?
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Here is the tutorial.
Fixes you might Try When Microsoft Cross machine Service Is Using High CPU
Fix 1.
Right-click theWindows logobutton on the taskbar and chooseSettings.

SelectApps>Advanced app controls>Share across devices.
Then choose theOffoption to turn off this feature.
Press theWindows + Xkey combination, then chooseTask Manager.
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Go to theStartup appstab, right-clickMobile devices, and selectDisable.
Fix 2. you could complete this task viaWindows Powershell.
TypeWindows Powershellin the search box, and then chooseRun as administratorfrom the right panel.
In the command line window, inputGet-AppxPackage CrossDevice -AllUsers | Remove-AppxPackage -AllUsersand pressEnter.
KB5039212 has been released for Windows 11 23H2 and 22H2.
If KB5039212 fails to install, you’re able to attempt the approaches in this article.
Fix 3.
Alternatively, you could wait for Microsoft to address it.