MBP is taking too many time to sleep

Hi,

I have a MBP mid 2010 with 8GB of ram and a 128GB SSD.

Since I've upgraded the ram and the disk to an SSD my mac takes about 45s to go to sleep when I close the lid. before it taked about 15-25s.

This time is the same if I have any programs open and if i don't. I found this on the kernel.log:

Mar 14 21:01:08 marcomartins kernel[0]: PMStats: Hibernate write took 21024 ms

Mar 14 21:01:08 marcomartins kernel[0]: all time: 21024 ms, comp bytes: 0 time: 0 ms 0 Mb/s, crypt bytes: 0 time: 0 ms 0 Mb/s,

so why is my mac taking more than twice this time to sleep if the write is done?

thanks