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You should check to see whether you're running the same version of Mathematica on both machines. There were some significant optimizations that sped up Mathematica for Windows from 3.0.0 to 3.0.1. If you have Mathematica 3.0.0 installed on your Pentium II Win95 system, and 3.0.1 running on the NT4 system, that would explain the difference. As a general rule of thumb, when doing such timing comparisons between OS's, it's always good to make sure that they have not only identical hardware, but identical versions of Mathematica; algorithmic or optimization changes in the Mathematica binary may account for speed differences even in .0.x releases. Sincerely, John Fultz firstname.lastname@example.org Front End Group Wolfram Research, Inc. Sebastian wrote: > > Hello, > I have recently installed Mathematica 3.0 on a new Pentium II system > with Windows95. While the performance was surprisingly good compared > to even an Ultra-Sparc system, I was quite disappointed to find that > an identical Pentium II system with Linux or Windows NT4 performed > TWICE as fast. > > I am used to the fact that Windows95 is about 20% slower than NT, but a > factor of two is unacceptable. Maybe Win95 is bad, but I assume that > Wolfram research simply didn't care to make their product run properly > under Windows95.....?? > > Question: Is there any way to speed up MATHEMATICA 3.0 under Win95?? > > (I know there was a similar problem with Mathematica 2.2, which ran a > lot faster under Win 3.1 than under Windows95) > > Best regards, Sebastian > > ----- > P.s.: do not hit reply, but mail to sebaste at hotmail.com instead.