How many components did you have?TLDR;
Don't craft too much as it will increase your loading times and there's no fix except to never craft anything ever.
Since the crafting system in this game is broken to heck, I decided to craft white medkits and break them down repeatedly (to farm components), then craft purple medkits and break them down to farm better components.
Since the process is tedious, I set it up that the craft button is a click and not a click+hold, then used an auto clicker to craft while I did something else.
I did this for about 30 minutes, then saved, happy that I had sufficient components to last me a lifetime.
I then died by picking up a corpse, then clicked 'Load Checkpoint'. To my surprise, the screen was black for almost 2 minutes before the game loading screen actually appeared.
I then realized that maybe this is related to the save corruption issue prior to 1.06 patch, where if your save file exceeded some size (due to crafting), it would become corrupt, so I loaded up a save file editor and removed all my of components (not before trying to manually craft things in order to lower the component quantities; spent about an hour trying to grind that down, no luck, too many components) and confident that I had solved the loading problem, I tried loading the game.
Same issue, 2 minute black screen then loading screen for maybe 5 seconds.
I then loaded a save file before I started my crafting marathon, and the black screen only lasted 15 seconds before loading the game.
Anyway, it turns out that the game remembers everything you craft, even if you delete it, remove it, drop it, sell it, use it to craft something else, it always remembers what you did, therefore excessively crafting will ruin your load times permanently.
I can live with 15 seconds of black screen, but not 2 minutes. Don't be like me, don't craft stuff, it's not worth it in the long run because you randomly die by stepping on the wrong pebble.