: Multiplayer servers are typically inaccessible in demo mode, though LAN play is sometimes possible. Why 1.12.2 is Still "Better" for Many
Launch the official application on your PC.
If you own the game, Microsoft allows you to download and play any historical version of Java Edition at no extra charge. This means you get the peak performance and mod capability of 1.12.2 without compromising your computer's security.
Modern versions of Minecraft Java Edition (1.18+) drastically increased the world height and depth, changing the generation engine entirely. While visually stunning, this made the game incredibly resource-heavy.
By default, the launcher may only allocate 2GB of RAM to your game. If you plan to run mods, update this setting: Edit your 1.12.2 profile in the launcher installations tab. Click at the bottom. Locate the JVM Arguments field.
Once OptiFine is installed, these are the most impactful settings to adjust for a "better" experience:
Minecraft 1.12.2 Java Edition: Why It Remains the Ultimate Version for PC Players