Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods What is the memory bar at the bottom-left?

Hey guys. Have you figured out what the greenish yellow bar means at the bottom-left of the editor? It looks like it shows the percentage used of some memory. I've got a decent sized map with some terrain paint. It's showing 50% of 1674mb.

I'm wondering if this "limit" is for the level, the mod, or my computer.

Thanks