Does Zeitgeist slow performance considerably

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http://askubuntu.com – This was talked to me today and I actually did not have a proper answer, so I was wondering if Zeitgeist had any impact in performance. For example if comparing Ubuntu with and without Zeitgeist in terms of: Memory Usage, CPU Usage and Performance in general. It is my believe that since Zeitgeist is mostly en Event Logger and not a File Sysyem indexer, the performance would be so low that it would not registered even on an old Pentium 3 when compared, like I said, with an Ubuntu that has Zeitgeist and one that doesn't. Am I right or wrong about this assumption? (HowTos)