minecraft-java-edition
Why is minecraft not rendering more than about 12 chunks?
Singleplayer not on a server.
I have tried allowing minecraft to use more ram but no effect.
Maybe because i dont have a graphics card?
Minecraft is only using about 30-40% of graphics in task manager.
(Unmodded) Minecraft isn't multithreaded, so splitting it across multiple CPUs is not possible. However, I am not sure about a mod to allow for this possibility. There might be other factors you are ruling out.
From what I have found the mod, OptiFine, is supposed to split the load across two cores. (Otherwise, Minecraft only uses one)
OptiFine 1.2.4 Mod adds a lot of options for better looks and performance. Doubling the FPS is common. Moves fog away, adds mipmaps, chunk loading control (mod CAF), Smooth FPS, brightness control, VSync and many other.
Screenshot of Optifine below:
Try getting Optifine and turning optimization features on. If that doesn't work or won't work, try allocating more RAM. To do that, in the launcher go to edit profile. In there, check JVM arguments and there will be probably -Xmx1G in it. Change the number to allocate more RAM.
Best Answer
Check your render distance in your Video Settings sub-menu settings options. It'll show as a slider on the top-right corner of the settings list. Increase it by dragging the bar to the right to increase the render distance