It only makes sense that Flash decompresses jpgs when it loads them. The visible property has nothing to do with that.

When you say visible = true, that would be the absolute worst time to decompress the image. Imagine decompressing 1000 jpgs at once in a for loop. Imagine when setting visible = true to check whether or not the Sprite contains an image somewhere in its child stack that has not been decompressed. There's no way those are tied together.

Setting visible does one thing. It prevents the pixels from drawing to the screen during the render cycle.
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