Is it normal for Lightroom Classic to take up this much VRAM for my 4090 GPU?

i upgraded from gtx 1060 6gb to rtx 3060 12gb,
 with double the amount of vram, i was expecting improved performance, 
but to my disappointment the vram wasn't freed at all and it used full vram
 and added including ram shared from the system, making my computer slower than before when using 1060 6gb, 
I used to think it would never use more than 8gb of vram because the 1060 6gb I use is stable and just enough!

i upgraded from gtx 1060 6gb to rtx 3060 12gb, with double the amount of vram, i was expecting improved performance, but to my disappointment the vram wasn't freed at all and it used full vram and added including ram shared from the system, making my computer slower than before when using 1060 6gb, I used to think it would never use more than 8gb of vram because the 1060 6gb I use is stable and just enough!

First immediate point that comes up is as follows:

Why is your Camera RAW CACHE at the default of 5 GB?

https://helpx.adobe.com/lightroom-classic/kb/optimize-performance-lightroom.html

https://petapixel.com/optimize-lightroom-classic/

https://fstoppers.com/originals/dramatically-speed-lightroom-performance-500071

P.S. Do you have a screenshot of whatever was telling you that so much VRAM was in use? That value in 'preferences/performance/ is the perceived by LrC available amount, not the in use amount (could be wrong)

I do not doubt that your LrC performance is bad. I do not doubt that LrC is using a lot if VRAM. Not with such a small amount of allowed CACHE. (this would be seen in develop module performance)