The iLok License Manager is an application which allows you to manage your licenses. It should put negligible load on your computer, but even then it doesn't need to be running to use your Eventide plug-ins, only to authorize them to your computer or iLok.
There is also a driver to communicate with the iLok that runs in the background on your computer. This is similar to a mouse driver or display driver and should put no noticeable load on your computer at all.
Dan
