why ubuntu 910 boot very slow?

[born]

hi,all!
     before Oct 29th,I had install the ubuntu 910 beta on my notebook.At
that time,it use 35 seconds to login into the system .
Yesterday,I installed the ubuntu 910 standard on the notebook.Now it use 75
seconds to login into the system.

My notebook is ASUS x31.the memory is 2G.
Is someone know the reason? Thanks any way!
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