The Update task is designed to run in the background and is intended to improve response time and performance by ensuring that when a user opens a database view, the user does not have to wait for it to be indexed.
Note: Do not remove the Update task from a server. If you do so, the Public Address Book will not be updated.
To improve view-indexing performance, you can run multiple Update tasks if your server has adequate CPU power. Doing this can affect server performance and is recommended primarily for multiprocessor machines. On a server with multiple processors, enable a maximum of one Update task per processor
This is done within the notes.ini file by adding the line:
Updaters = [number of processors]