I was able to get 128x128 working to some extent, and as an added bonus, WITH shaders.
I used the following supporting mods
Optifine 1.12.2 HD C9 (Though any versions AFTER this should work)
BetterFps
VanillaFix
FoamFix
8GB RAM, as well as 8GB of VRAM are preferable, though you should be able to get away with 7 of each.
Some users (particularly those running newer AMD and NVIDIA gpus) experience a rather disgusting skybox error or sometimes crash with optifine installed, especially with shaders.
To fix this, go to
Code: Select all
FTBContinuum/minecraft/config/advRocketry/advancedRocketry.cfg
and change
to
Because I don't actually have 8GB of VRAM, I actually quickly run out and run into issues, but until I actually run out it seems to operate just fine. Make sure your graphics drivers are updated, especially if you plan to run shaders alongside these.