I have CS6 installation on Mac Pro 4,1 quad core with 16GB of ram with OSX 10.9.
Only four instances are working now, and there are no other processes except one CS4 on this machine.
After few months server have problem with speed, sometimes server is working very slow. Changing content in one text frame, changing style takes more than one minute. Content is short, few characters and documents have less than 100 text frames.
This same operation normally takes few ms.
CS4 instance on this machine works fine.
Regards
Piotr