ShellExperienceHost.exe is a vital part of Windows 10 but you can reduce it’s overhead.
- Don’t use slide shows for the Windows background.
- In settings visit Personalization > Colors and turn off the “Automatically pick an accent color from my background” option
This is a process which can run wild with resultant performance problems.
If you are running a decent security product then you don’t need this.
This may be disabled via the Registry.
Create or amend the following entry:
HKEY_LOCAL_MACHINE/SOFTWARE/Policies/Microsoft/Windows Defender/DisableAntiSpyware = 1
This is a DWORD type value.
Reboot and the process should be gone from your machine (hurrah!)