Flash scene load time

When using a flash build of my game, scenes are taking significantly longer to load, to the point of it becoming very annoying to users. The lightest scene (2 2048x1024 textures on planes) takes ~2s to load. the heaviest scene (1 2048x1024 texture + ~30 lightmaps on 10k tris) takes ~18s to load. In the web player, the same scenes take 1s or less to load.

This is in the preview version of Flash on Unity 4b7. Is this just a limitation of Flash / Flash preview? Is there any way to optimize this since the users will be able to jump between any number of scenes quickly?