If you want higher FPS, use Fabric Loader with Iris Shaders.
For the 128x Basic pack to look correct, you must change these settings in Options -> Video Settings : patrix-1.16-128x-basic.zip
Provides the foundational high-definition (128x resolution) textures for almost all standard blocks, which are significantly more detailed than the default 16x Minecraft textures. Photo-Realism: If you want higher FPS, use Fabric Loader with Iris Shaders