At a conference a few years ago I spoke with a friend who said “when I talk to people who say “I’m going to publish 5 papers this year, even though I haven’t submitted any” and it’s July I smile inside. It takes so long to publish papers there is no way they will be able to publish 5 by December”. It’s true, it takes forever to publish (after the writing and submitting part, which for me takes awhile too).
But some scientist, even Nobel Prize laureates, are publishing things online before even submitting it for review in an “official” publication. Not only does this cut out the journals who are arguably making a ton of profit off our free labor (see here and here), but it gets your work out to the scientific community faster.