Mac - Tool to slow down the network for Development testing?

is there a Mac Tool that can simulate a internet connection for local d开发者_如何学Cevelopment testing purposes?

I want to test ajax loaders etc, but since it's a local machine it's to fast?

Rails 3 App on a Mac, locally hosted

Thanks

The SpeedLimit prefpane by mschrag does what you want:

http://mschrag.github.com/

I'm not sure if it works for localhost, but it works great for everything else, and it's incredibly easy to use, so it's definitely worth a try.

I believe that WaterRoof does what you're looking for. It acts as a frontend for ipfw, a packet filter for FreeBSD, which OS X is based on. NoobProof is a simpler interface for the same system, if you want to try that as well.

http://www.hanynet.com/waterroof/

http://www.hanynet.com/noobproof/

http://www.charlesproxy.com/ is the best I found for OS X.