libjpeg-turbo is a version of libjpeg which uses MMX, SSE, and SSE2 SIMD instructions to accelerate baseline JPEG compression and decompression by about 2-4x on x86 and x86-64 platforms. It is based on libjpeg/SIMD but has numerous enhancements. NOTE: The package installs to /opt/libjpeg-turbo by default. Pass PREFIX=/usr to the SlackBuild to build it system-wide, but it will overwrite Slackware's libjpeg package.