How to make a banner 3x6 meters in Illustrator (CC, but the version is not important)?

Question

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There is a task to make an advertising banner and prepare it for printing. The banner will contain photos and text. I make the document size 3x6 meters (real, creepy meters), the file turns out to be too large. I want to know if it is possible, while maintaining the proportions of the banner, to make it smaller (but so that it is 3x6 meters when printed)? What is the best way to do this? And what to do with the photo in this case (will it lose quality if it is reduced)?

Answer 1

@wyjka link the images, especially since they require it in the printing house, you can color-correct all bitmap images and the weight will decrease dramatically. A print quality of 100dpi will suffice.
Here, read about the scale:
www.svetogor.com/trebovanija-shirokoformatnaja-pec...

Answer 2

Do you link photos or paste them into a document?