Yeah cool if you have the same specced PC parts pls let me know wehere to get your time travel machine ddr6 Ram is expected in 2024 to 2026 to come to market.
Ok now the joke beside, you have a RTX 3060ti, if i am correct this card has 8 GB VRAM.
D IV needs lot of VRAM and has a VRAM Memory Leak at the Moment and 8 GB is simply not enough for the load with HD Textures installed.
I suggest you deinstall the HD Texture for D IV in the battle.net client settings for D IV, i hope the will change how often the game drops FPS.
They said the have somthing in the works for the VRAM usage and Memory Leaks for and after Season One, you can then try it out with reinstalling the HD Texture-Pack.