Are you playing on the latest beta release? Retro said they would be fixing it soon in WO and it would eventually get to WU ... I know the last update from them was Jan 2020 or something. I've never updated to that apparently.
For now I'll try the mods and see if that fixes it too.
(btw while you're looking at this, LOVE the server lol)
I once had this problem too... for me it was a stupidly large keybindings.txt file...
Steam\steamapps\common\Wurm Unlimited\WurmLauncher\PlayerFiles\configs\default (if you dont use default, check the others too)
That file should have around 4 KB if it didnt expand too much yet. This is caused due to wogic... instead of rewriting the keybindings.txt wurm just adds whatever you added into console at the end of it and well that can add up to quite a lot and then it bugs arround at times... best to setup "autorun.txt" once to save your keybindings to prevent this from happening again... IF you have the same problem as me
EDIT: Can just delete the keybindings.txt (or make a backup), it will get recreated on next startup... this might remove any keybindings tho if you didnt set them up otherwise.
Removed all mods, Still hangs up the system while loading the launcher.
Checked the keybindings.txt ... they were way larger than 4kb, but not unbearable yet. Also you taught me about the autorun.txt which will alleviate some keybinding headaches I've been having lately, unrelated to this issue.
All in all, problem persists.
It's not a huge deal, just thought I'd check if it was wide spread and there was a solution.
Did you try deleting the keybindings.txt (or make a backup to undo the deletion afterwards), even 1 MB of keybindings.txt can freeze a PC. For me it slowed down at 450-ish KB, but my PC is a lot less powerful than yours to begin with .