I have had this problem on my RTX2080ti, I still have this problem on my RTX3090 where it can go as low as 10-20 frames.
If I swap out to a GTX1080, the problem goes away and I never ever drop below 100 frames, ever.
Something is VERY wrong with how Minecraft deals with RTX cards and high resolution texture packs.
Please fix this so that we can use the texture packs we paid for, in the game we paid for, on the cards we paid for.
Well, if you won’t fix it, who do I contact about getting a refund for all the packs I purchased through your store. This is a known (to you) bug that makes the texture pack products unusable (due to extremely poor performance) on RTX hardware, yet you continue to offer them for sale on your store with no notification of the defect. This needs to be made right, one way or the other.