The problem with fast consumption is it's shallow, and the only way around it I've found is the 1:3 rule. For every ten minutes of information consumption, you'll need at least another thirty minutes of tinkering about with your hands, keyboard, pencil and paper, etc. to have any chance of really absorbing and understanding that information.

However, this is much harder and more demanding of your concentration and focus than just passively absorbing some interesting online content, particularly if the content relies on some background knowledge that you're missing, in which case it may take much, much longer to get up to speed on it.

Note that LLMs are an incredible aid to grasping new material. Ask any decent LLM "what are the necessary background prerequisites for understanding this statement: <HN comment on arcane math or tech>" and it will usually point you in the right direction.