The more history on an object the larger the file, therefore the more RAM and processor power needed to deal with it.
Once you are 110% finished with a model, delete its history, it could mean the difference between a 16Mb and a 2Mb file...
Oh and system halts or crashing...
Chris (formerly R@nSiD)
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When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)