[argyllcms] Performance comparison

Dear argyll fans,

As since the release version, there have been a lot of performance improvements 
to the profile generation app, I felt that it was a good thing to really test 
and present the differences:

I have used following string to compare with:
profile -v -qm -bh -r0.0 -SAdobeRGB1998.icc profilename (string used until 
release version)
colprof -v -qm -bh -r0.0 -SAdobeRGB1998.icc profilename (string used in release 
version)

Here the results:

previous beta versions: 
230 seconds.

release version: 
118 seconds.

release version with performance tuning (tested on Tiger):
export ARGYLL_REV_ACC_GRID_RES_MULT=2.5
81 seconds.

Just comparing the performance between the old and new version, the speed of 
profile creation has almost doubled! Now with some additional performance 
tuning, the speed is almost 3x! Everybody who knows about programming 
understands that increasing performance is a hard thing and sometimes with a 
good potion of work it's possible to improve it 20 or 30%. But this one is 
300%!!!

Congratulations, Graeme!

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