Yes, it will. The nice images created by a screen saver will use up some of the CPU cycles. If you do not run a screen saver then the UD agent will maximize the available CPU time while you are away from the computer. A UD screen saver is installed with the client and can be easily turned off if desired.
As mentioned by Ian and others: Remove UD as your screen saver and make sure that "Run only as screensaver" is unchecked in the preferences. Take a look at the FAQ at the top of the forum for help in setting things up to maximise crunchtimes etc.

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by Equinox6 edited by KeysCapt