Converting big psd file is slow

Hi,

I'm trying to convert PSD file as JPEG.

(version 6.0.7):
$ time identify test.psd
48 PSD 8000x12000 DirectClass 186.0mb 0.120u 0:01

real    0m0.174s
user    0m0.124s
sys     0m0.016s

(version 6.3.2):
$ time identify test.psd
-> long time

$ convert -size 800x800 -verbose -flatten -colorspace rgb
-thumbnail  
400x400 -density 150x150 -units PixelsPerInch -limit memory
512 - 
limit map 512 -strip -auto-orient  test.psd jpeg:test.jpg

takes a very very, very long time on both versions (6.0.7
and 6.3.2)

Is there some options or method I can use to make this
faster?

Thanks,

Joose

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