I can quantify the slowdown of the system after a suspend-to-RAM. I am not sure 
if the same result applies for a suspend-to-disk.

Steps to reproduce:
1. Boot up computer
2. Run a sample program and time it.
3. Suspend to RAM
4. Wake up.
5. Run the same sample program and time it.

Time taken will be about 3x more.

Attached are a ps report, a lsmod report, and a report of a sample program 
(lame encoder in my case), both before and after the suspend-to-RAM.
 

** Attachment added: "document_slowdown"
   http://launchpadlibrarian.net/22433415/document_slowdown

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System very slow after suspend-to-ram
https://bugs.launchpad.net/bugs/236275
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