When opening any previous saved world or creating a new world, Minecraft freezes at "Building terrain".
Have tried to delete all content in /.minecraft/ folder and re-launch, but it has same issue.
Have also tried default start setting and change -Xmx1G to -Xmx2G as well as -Xmx4G

Logs attached:
[21:46:54] [Client thread/INFO]: Setting user: XXX
[21:46:55] [Client thread/INFO]: LWJGL Version: 2.9.4
[21:46:56] [Client thread/INFO]: Reloading ResourceManager: Default
[21:46:56] [Sound Library Loader/INFO]: Starting up SoundSystem...
[21:46:56] [Thread-3/INFO]: Initializing LWJGL OpenAL
[21:46:56] [Thread-3/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[21:46:56] [Thread-3/INFO]: OpenAL initialized.
[21:46:57] [Sound Library Loader/INFO]: Sound engine started
[21:46:58] [Client thread/INFO]: Created: 1024x512 textures-atlas
[21:46:59] [Client thread/INFO]: Narrator library for x64 successfully loaded
[21:49:27] [Server thread/INFO]: Starting integrated minecraft server version 1.12.1
[21:49:27] [Server thread/INFO]: Generating keypair
[21:49:28] [Server thread/INFO]: Loaded 488 advancements
[21:49:28] [Server thread/INFO]: Preparing start region for level 0
[21:49:29] [Server thread/INFO]: Preparing spawn area: 16%
[21:49:30] [Server thread/INFO]: Preparing spawn area: 37%

--> Here it get stuck