Because the XRay 1.12.2 Resource Pack relies on texture logic rather than calculation logic:
They use simple transparency, which rarely causes lag. x ray 1.12 2 resource pack
Using X-ray resource packs on multiplayer servers violates almost every server’s rules and is considered cheating. In single-player, it’s your choice but trivializes gameplay. Because the XRay 1
These packs can often be "stacked" on top of other resource packs in the Minecraft menu, allowing you to keep your favorite textures while gaining X-ray vision. Essential Performance Tips x ray 1.12 2 resource pack