If you opened Windows' Task Manager recently, you might have noticed a process labeled Search Filter Host constantly running in the background. While harmless, this process can nevertheless sometimes cause your computer to become sluggish. Fortunately, it is possible to stop that process from impacting your computer's performance by following a few steps.
SearchFilterHost.exe is a file used by Windows Search, a feature of your operating system. Windows Search uses a series of constantly-running processes, such as Search Filter Host, to index the files on your machine. Thanks to this feature, Windows can instantly display a list of relevant files as you type a keyword in your Start screen's search box.
While Search Filter Host is a legitimate and harmless Windows process, some users have reported that it can use almost all of a computer's resources. To fix this issue, Microsoft support engineers recommend to first rebuild the search index (link to procedure in Resources) to see if that solves the problem. If not, boot your computer in safe mode and see if the problem persists. Finally, perform a clean boot (link on how in Resources) to try to identify which application or driver might interfere with Search Filter Host. Another action you can take is to perform a full-system scan of your machine with a reputable antivirus application. Finally, if you are still experiencing this issue, try stopping the Windows Search process manually using Windows' Services Manager, rebooting your computer and restarting the process.
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