In Mac operating system, SystemUIServer is a process that is responsible for controlling the interface aspects. Some of the users have reported several freezing problems with this process, which makes whole of the system in non-responsive state. All of a sudden, the SystemUIServer starts taking the unexpected CPU usage, with no apparent reason. In this condition, you left with no other option to forcibly killing the process. The process gets repeated again and again and hence drags the user in a real critical problem.
This can happen after having the updates of the system software, so some of the users switch to reinstall the system software, thinking it of the related problem and harshly suffer data loss problems. This has been reported that this could be the fault in the menu-bar items which depend on the internet connection. The insufficient or incorrect data receiving by them can make this CPU load through SystemUIServer. Thus if possible, delete those items and then restart the process. The third party menus can also create this problem.
Another approach could be made by deleting the com.apple.systemuiserver.plist file located in ~/Library/Preferences.
But if you have lost data during the course or have reinstalled the operating system on the un-partitioned hard drive, then Mac data recovery is the need of hour. The Mac recovery in any case requires the scanning of the hard drive with the suitable phenomenon, which is well applicable by Mac data recovery software.
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