Unity import freeze - Can't do anything

No matter what I try, no matter the FBX or Blend file, Unity takes 10+ minutes to import anything. This has been a problem only as of today, never had an issue before this and have even gone so far as to fully re-install Unity and clean all caches. At first I thought it was the new model, but it does it with everything now.

Can anybody please help me?

What are your computer specs?

GTX 1070 with 16 gb Ram on a Ryzen 7

Never had issues until I started one project, but then all of my projects started being affected.

Re-did the entire .blend file for the first project and it just cured it all, apparently.