Compress images effect

the new option since Beta 8, but I don’t know what does it actually affect, when I turn it on, I found the game occupy Less RAM but more VRAM. opposite, when I turn it off, more RAM less VRAM. I don’t see any changes in Graphics and don’t think this option will improve or drop the FPS. what is it actually for? (by the way, I have about 40 mods of real airlines)

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