This is a pre-emptive multitasking piece of software. Normally, RiscOS assigns processor time to all applications loaded. However, should the program not need all this time, then the time is not released. Wimp2 will snatch this back (it's checked once every 10us IIRC). With the new boot stucture, place the Wimp2 module in the predesk and the Wimp2Patch in the tasks.