Encountering an error message indicating that Minecraft has exhausted available memory while attempting to load the .schem/.schematic file you're pasting? This can lead to game slowdown or even crashes. To resolve this issue, consider increasing the memory allocation for Minecraft by following these steps:
Launch the Minecraft Launcher: Locate and open the Minecraft Launcher application.
Access Installations: Navigate to the top menu and click on "Installations".
Select the Minecraft Installation: Identify the installation you use to play Minecraft and click on it.
Expand Installation Options: Click on "More Options" to reveal the extended options for the chosen installation.
Locate JVM Arguments: Look for the field labeled "JVM Arguments".
Modify Memory Allocation: Within the "JVM Arguments" field, you'll find a line resembling "-Xmx2G". This parameter determines the maximum memory Minecraft can utilize. Adjust the value to a higher number, such as "-Xmx4G" to allocate 4GB of RAM or "-Xmx8G" for 8GB of RAM allocation. For larger schematics, you may need to increase the value further.
Save Changes: Click on "Save" to apply the modifications you've made.