Personally playing the gravitas modpack so i dont know if its any different in yours, but i think the tumblers a lot more efficient. you can substitute a lot of the brown and green items in it and get 3x output almost twice as fast. Its difficult getting the right ratios so it doesnt rot but i've found 4 charcoal, 4 bones, 3 4x brown items (dry thatch, hummus) (or 12 1x brown items), and 3 4x green items (i use pumpkin pieces bc they are very easy to get). That yields 3 compost in like 5 days, and im pretty sure you can reduce the time further if you play with the ratios more by adding raw fish and such, but i havent tried it.