Ok so this has been bugging me for a while and I want to actually understand it instead of just accepting it as magic. When you type a normal question into ChatGPT, it feels instant-ish, fine, that's expected. But what gets me is when you upload like a 40-page PDF and start asking questions about it — it still replies almost as fast as a plain text question. Like, intuitively, shouldn't "reading" all that extra text take way longer before it even starts answering? So let's break do...