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From: Sebastian Szwarc on 7 Aug 2010 01:30
Hi,
On Mathematica 7.0.1 I've noticed several strange behaviours regarding
to time of calculations.
I have MBP 2,56 4GB RAM (late 2009 model).
I compared some notebooks with my friend computers (4 cores amd similar
cpu freq) that is 2x faster than mine, however:
-matrix multiplication is over 6 times slower on my machine

I also installed windows 7 on my computer and used Karl benchmarks.
It looks that

Timing[Eigenvalues[Table[Random[],{1200},{1200}]]][[1]] and

Timing[Sum[
2/\[Pi] Integrate[Log[2 Cos[x/2]]*Cos[n x], {x, 0, \[Pi]}], {n, 0,
15}]][[1]]

works siginificantly slower on macos for unknown reason.
Also in the latter when I did calculations first time it resulted in
Out[12]= 30.6088
again was 3, again 1,49 so after 3rd run is faster 20 times!

Anyone noticed some similar behaviour or have some explanation on this?
I could find any relevant information on Wolfram Tech Forum :((

regards
Sebastian

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