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To check how osx manage sleep, type:
  
pmset -g | grep hibernatemode
  
hibernatemode = 3 - saves all memory to disk
hibernatemode = 0 - keep memory active all the time

To get super fast sleep, just type:
  
sudo pmset -a hibernatemode 0

sudo ln -s /dev/null /var/vm/sleepimage  

Additionally remove sleep file:
  
sudo rm /var/vm/sleepimage
sudo touch /var/vm/sleepimage
sudo chmod 000 /var/vm/sleepimage

Go back to hibernate:

sudo pmset -a hibernatemode 3
sudo rm /private/var/vm/sleepimage