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A. Components & Groups Aerial images at low and high resolution should be separate layers and should be kept at hand. The texture editor allows you to swap low-res textures for high-res. A photo editor such as Photoshop can be used to save large aerial images. If you want to reduce your size of jpg without sacrificing quality, drop the quality of the image. B. Avoid Plunging Geometry Heavy Furniture on the same layer Geometric heavy furniture should not be placed on top of other items of furniture, and should be turned off when doesn't need to be used. You need to maintain your geometry's independence from other geometry by using groups to prevent it from blending with other geometry, so you can make updates quickly.