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.

>>29
This literally never happens
Most of the time is spent at start up

Just to confirm, I opened ``Transmetropolitan - I Hate It Here (2000) (c2c).pdf'' for a quick read.
Start up took about 5 or 6 seconds, but after that the pages all loaded instantly even though I scrolled down pretty fast.