Crazy slow textures/world loading last 2 days

For about last 2 days, i suddenly expirience super slow loading of textures/maps/projectiles(!) and sometimes even enemies in general - super "fun" getting killed by invisible mobs, btw... Or invisible flowers or crags.
Atlas loads like 10 second sometimes!, while being super buggy/laggy.
What happened? Everything was ok before that.
Games obv. on ssd, no driver/windows updates performed.