macOS has embedded feature that allows slowing down network calls. Similar to the IP/netfilter suite Linux has. PF handles most of the magic behind the scenes.

macOS has embedded feature that allows slowing down network calls. Similar to the IP/netfilter suite Linux has. PF handles most of the magic behind the scenes. Even better because there is an UI to configure it. You just need to download Xcode additional tools package, there is a NetworkConditioner.prefpane inside. Install that and various settings will show up in the regular System Settings/Preferences...