Looks like I need to compile R and my libraries with AVX2 support. # list available instructions $ gcc -march=native -dM -E - < /dev/null | egrep "SSE|AVX

Looks like I need to compile R and my libraries with AVX2 support. # list available instructions $ gcc -march=native -dM -E - < /dev/null | egrep "SSE|AVX" | sort This post has some info, but no benchmarks. https://stackoverflow.com/questions/37213060/does-r-leverage-simd-when-doing-vectorized-calculations/37214261#37214261 https://stackoverflow.com/questions/37213060/does-r-leverage...