Installing, adjusting, and upgrading Windows updates is the main work of the Windows Modules Installer Worker (TiWorker.exe). It can use a lot of CPU and disk resources while installing updates, which will slow down your machine. This typically occurs while Windows is applying updates or scanning for them in the background. Although TiWorker.exe occasionally uses resources, if this continues, it may be a sign of corrupted updates, system problems, or an outdated version of Windows.