Part of it is probably because precompiled binaries are rarely built with flags that allow advanced instructions (MMX/SSE/AVX) to be used because the binaries w

Part of it is probably because precompiled binaries are rarely built with flags that allow advanced instructions (MMX/SSE/AVX) to be used because the binaries would not be very portable. Building from source you can add -march=native to get faster code (although sometimes I suppose this is risky).