A lot of distros now package ImageMagick so it uses the libjpeg-turbo library, a drop in replacement for libjpeg that makes effective use of vector units.
Praise for this library is pretty universal, for example: http://planet.roxen.com/blog/developmen ... /index.xml.
Now, some package managers just delete the standard libjpeg.so and silently substitute the turbo one (or maybe it's the libjpeg-turbo install script that does the substitution?).
Maybe the IM documentation should suggest installing libjpeg-turbo. If the "automatic substitution" is universal, there is no need to recompile ImageMagick: As long as libjpeg-turbo is installed, the major speed up is there.
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