Ever wonder why software is so slow...?

Because it's all written by retards.

https://github.com/ArtifexSoftware/jbig2dec/blob/master/jbig2_image.c

Scroll down to jbig2_image_compose_unopt()... and then facepalm. It doesn't take a genius to realise that twiddling an image pixel-by-pixel is going to be dead slow.

>>63

Just avoid using C++, otherwise you calls would go through an endless abstraction chain. Plain C is just faster, especially because it forces you to allocate all resources in advance, without these unpredictable RAII smart pointers.