Client always crashes upon trying to load a very large schematic

[WichtigerGamer]

I tried to load a very large schematic (about 10k by 19k) and my client always crashes a few seconds after vainly trying to load the schematic.
How much RAM do I need to load a schematic that large (and assign it to my client, of course) and is it even possible?
Is there maybe some way to optimise my client and everything so it can load?
I have 16 GB of RAM by the way, and here is my crash log (https://pastebin.com/4YVLNW3k)

[el97]

It is possible to change the allocated amount of RAM by going through the settings for your selected profile in the launcher. I recommend that you change to the half amount of what you have available at first and see if it works. Here is a quick guide:

• Start the launcher.
• Go to installations.
• Click on the 3 dots to the right for your profile.
• Click on edit.
• Click on more options.
• Change the first numbers in the row to the half of the amount of ram that you have available. In your case you should change it to 8G instead of the default 2G

Make sure that you have the latest version of Java installed and that you use the 64 bit version of it.

[el97]

Keep in mind that Schematica is outdated and you should look at other alternatives such as litematica or similar. I know that you can use files from Schematica in litematica as well.

[WichtigerGamer]

I already tried it out with more RAM, should have said that in the first post, it didn't work either. I am using 1.12.2, so I can't use Litematica, but only Schematica.
What I could try out is installing the newest Java version, and thanks for the response btw.

[omerien]

The problem isn't Schematica or Java, just your memory.