Ok I'll try and reinstall Minecraft, thanks for the help :) (On Optifine, it shows as 200/32 FPS for instance, not sure if the first or the second one is the one to go by, many thanks)
JVM is: -Xmx20G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Video settings are: Graphics: Fabulous! Smooth Lighting: Maximum Smooth Lighting Level: 100% GUI Scale: Auto Brightness: Bright Dynamic Lights: Off Render Distance: 64 Chunks Max Framerate: Unlimited View Bobbing: On Entity Shadows: On Attack Indicator: Crosshair Dynamic FOV: On
There were a few more options in some other sub-folders, do you need those as well? Many thanks!
The texturing part would probably be easy as I plan only to make buckets for the default 22 fish and a few rare ones that I keep in my current base. I'm not familiar with custom NBT crafting though, do you know a datapack that uses it?