How to choke network preformance on OS X Possible Duplicate:
  How to simulate slow internet connections on the mac  




For testing purposes I would like to choke the performance of the network on my OS X 10.8.2 machine. 
I have currently Little Snitch installed, which I can block access to certain hosts with... however I would like to lower the network performance as if I would be using an 56k6 old-school modem. 

How can I accomplish this?
Although you can use command-line tools to do this, Apple has a developer tool that allows you to do what you are talking about from a control panel. There are presets available, or you can set your own performance limits. The tool is called "Network Link Conditioner" and is available on Apple's developer download site with a package called "Hardware IO Tools for Xcode".

Here is a blog post discussing the tool (with screen shots):
http://mattgemmell.com/2011/07/25/network-link-conditioner-in-lion/