Allocating RAM to Minecraft allows the game to load demanding texture packs.
Important: you can’t allow more memory than the amount present in your system
Launch options
Advanced settings
and then open your profileJVM Arguments
and replace everything with -Xmx4G
Now replace the 4
with the amount of RAM you need.
For example: if you need 4GB, paste -Xmx4G
. If you need 16GB, paste -Xmx16G
.