Set it to allow smoothing and see if that helps.
Smoothing has changed absolutely nothing, no difference.
I made four tests.
It looks like as bigger bitmap is as big the difference in size while trying preserve the same quality.
Here I present four links:
Compression set to both. Large bitmaps have same quality but swf is 2x bigger
Compression set to both. Large bitmaps have same size but swf has much worse quality
Compression set to both. Small bitmaps, almost the same quality, size the same
No compression to both. swf smaller, quality the same
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If you are questioning Flash's compression compared to Photoshop, you probably shouldn't spend too much time on it. Photoshop is image editing software, Flash is not. You should expect Photoshop to have more/better features for manipulating images.
I just thought that both Photoshop and Flash are made by the same company, so tolls for compressing images would be similar.
PS. What languages Photoshop and Flash are created?