How big are the videos in the three video layers? I would thing your solid color layer would compress well and not require that much data.
The videos are not embedded or anything I am drawing each frame, so I am not sure what size each layer is.
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Duplicate your document and delete the video layers in the dupe save and see what the file size is. Make sure you are right about the videos are not embedded. three solid 1920x1080 layers should not be 700MB. 10FPS x 20sec = 200 frames 1920x1080. Uncompressed a frame would be around 6MB 200 Frames 1200MB. A file would be compressed. I do not do videos so I have no idea of the size a video PSD work files would be. The would not be compress as well as video files.
700MB to my gut seems large. You need to file out what is causing the bulk of the data.
I found out the problem. I was doing some pretty intense zoomfor in and there was a bunch of linework and stuff outside of the canvas on photoshop that I could not see. When I pressed command+T to transform, the bounding box was gigantic, so I just had to Command+A to select all and then get rid of what was on the outside of the canvas!