Without OptiFine, the pack will still work, but you will miss half the beauty—especially the connected textures and custom block states.
Vanilla 1.18 is already more demanding than older versions due to higher build limits deeper caves. Adding an HD texture pack increases memory usage. Here is how to keep 60+ FPS: rasplin vanilla texture pack 1.18 download
Many packs claim to be “vanilla+” but stray too far. Rasplin’s work maintains the original pixel art style while adding subtle highlights and shadows. Your old builds will look brand new without needing redesign. Without OptiFine, the pack will still work, but
The most authentic versions are typically found in the Rasplin Discord server or via links in Rasplin's YouTube channel descriptions. the pack will still work