1.20 PureBDCraft incompatible with Lunar client?

[Snaxx23]

I just downloaded the 1.20 512x512 Version of PureBDCraft and tried it out using Lunar Client. Turns out i get 1-2 FPS using it regardless of what i change in the settings. Is there something i missed or does the Texture Pack not work with Lunar client? I turned off all smoothing options as well as Vsync in the NVIDIA control panel

MC version: 1.20

Hardware: RTX4080, 64GB RAM, I7-12700K

[HanFox]

I'm unfamiliar with the Lunar client, but you can take a look at the "Low FPS / poor performance on good hardware" section of the Java help thread:
viewtopic.php?t=1093