[eselect news]2012-04-24 The default JPEG implementation

2012-04-24-libjpeg-turbo-by-default
  Title                     The default JPEG implementation
  Author                    Samuli Suominen <ssuominen@gentoo.org>
  Posted                    2012-04-24
  Revision                  1

libjpeg-turbo is a derivative of libjpeg that uses MMX, SSE, SSE2,
and NEON SIMD instructions to accelerate baseline JPEG
compression/decompression by about 2-4x on amd64, arm and x86
platforms. It is based on libjpeg/SIMD but has numerous enhancements.

All users are recommended to migrate:

# emerge --deselect media-libs/jpeg
# emerge --oneshot media-libs/libjpeg-turbo

media-libs/jpeg:0 will be left in tree as a fallback implementation.

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だそうで。