argh - seen this to late.
the drive won't fit!!
the vaio p uses 1,8 drives - so the 2,5 is way to large to fit in this tiny beauty.
not all vaio p's have ssd's - there are more with hd's than with ssd's
the main problem for the sloooow boot problem is the standard OS - it's vista and that makes it slow.
my vaio p is a dual boot with snow leopard and windows 7 - snow leopard boots in around 55 seconds and booting 7 will took 5 seconds more to get up.
([http://www.youtube.com/watch?v=c3yTHZbGviM|my vaio p dual booting])
[http://image.itmedia.co.jp/l/im/pcuser/articles/0901/08/l_tm_0901pmb_09.jpg|here] you will find a teardown of the vaio p