TiWorker.exe, also known as Windows Module Installer Worker, is a system process related to Windows Update. Basically, it manages the installation and removal of Windows system updates and other components. When the operating system is downloading and installing updates, or when you are running Windows Update, TiWorker.exe will take up some system resources in the background.
You should know that TiWorker.exe will cause high disk or CPU usage from time to time if you are using Windows 10. That is because Windows 10 will automatically download and install updates regularly using Windows Update. Therefore occasional slowdowns by TiWorker.exe should be considered normal.
