The most immediate change is right there in the name: "Tightfault." The developers have successfully tightened the visual language and the mechanical responsiveness. In previous versions, there was a slight feeling of bloat or looseness in the controls/interface (depending on your use case), but 18.9 feels incredibly precise. Everything snaps into place. It feels polished, professional, and streamlined.

Open Minecraft, go to Options > Resource Packs > Open Resource Pack Folder .