Hello there.

I have recently discovered that OpenSCAD runs consistently four times
faster in my work computer than my computer at home. The "mystery" in the
subject line is that the specs seem to indicate an advantage in the
opposite direction:

WORK
CPU: Intel Core i5 4570S (2.9/3.6 GHz, April 2013)
cpuboss.com/cpu/Intel-Core-i5-4570S#specs
RAM: 24 GB

HOME
CPU: Intel Core i7 6700K (4/4.2 GHz, July 2015)
cpuboss.com/cpu/Intel-Core-i7-6700K#specs
RAM: 32 GB

Same operating system (Windows 10 x64) on both. Not considering number of
cores and GPU because... OpenSCAD, you know :-)

This CPU comparison puts my work unit above my home one in single-core
performance, but not enough to explain the 400% difference:
cpuboss.com/cpus/Intel-Core-i7-6700K-vs-Intel-Core-i5-4570S

Any ideas?

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Regards from Spain,
Antonio

I can't explain this but you are not alone...I have two MacBook Pros, that
are generationally apart one being from 2011 another from 2014 other than
that same OS, 16GB RAM, i7 CPU (generation apart clock rates 2.3 old vs 3.1
new), both SSD (new one is much faster) only real difference is the graphics
cards one AMD older the other Intel new, they spec similarly, and I have
been told the GPU is not really important and again they should be similar
performance.

Yet the older machine will almost always render faster both preview and
final STL creation.

Sometimes the difference is minor a few seconds or on that order but for
some high $fn number renders it can be minutes on a 2 to 5  minute
process...so half as fast....I can't explain it but sometimes I just remote
into the older machine and render there.  This frees up my working laptop
and faster results too....I just expected the much faster clock and newer
CPU on the new machine to quicker....

Odd..maybe a quirk in how I code...which is probably the least efficient
method possible and since I never really try top optimize for speed and
frankly don't understand scad enough to really know how anyway...or maybe
something in the Mac or MacOS.....generally the machines feel pretty similar
except for disk speed and scad.

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Sent from: http://forum.openscad.org/