iPhone Simulator - Simulate a slow connection?

Is there a way to slow down the internet connection to the iPhone Simulator, so as to mimic how the App might react when you are in a slow spot on the cellular network?

How to install Apple’s Network Link Conditioner

These instructions current as of October 2019.

Warning: If you just upgraded to new version of macOS, make sure you install the very latest Network Conditioner (in Additional Tools for Xcode) or it may silently fail; that is, you will turn it on but it won’t throttle anything or drop any packets.

Update: As of Xcode 11, there may be an even simpler way to simulate network conditions on tethered devices; see this blog post. For how to affect simulated devices, continue below, as before.

1. Install Xcode if you don’t have it.

2. Open Xcode and go to Xcode › Open Developer Tool › More Developer Tools…

3. Download Additional Tools for Xcode (matching your current Xcode version)

4. Open the downloaded disk image and double-click the Network Link Conditioner .prefpane under “Hardware” to install it.

5. There we go!

6. Be sure to turn it on. You need to select a profile and enable the network conditioner.

Caveat

This won't affect localhost, so be sure to use a staging server or co-worker's computer to simulate slow network connections to an API you’re running yourself. You may find https://ngrok.com/ helpful in this regard.

"There's an app for that!" ;) Apple provides "Network Link Conditioner" preference pane that does the job quite well.

• for Xcode versions prior to 4.3, the pane installer can be found in your Developer folder, e.g. "/Developer/Applications/Utilities/Network Link Conditioner", after installation, if daemon fails to start and you don't want to reboot your machine, just use sudo launchctl load /system/library/launchdaemons/com.apple.networklinkconditioner.plist
• if you are already done with Developer folder, you can install the pane as a part of "Hardware IO Tools for Xcode" package available via Mac Dev Center additional downloads section.

Link to download page (you must log in with your Apple ID): https://developer.apple.com/downloads/index.action
(credits to @nverinaud)

An app called SpeedLimit

https://github.com/mschrag/speedlimit

Works great.

chris.

It also worth mentioning that Xcode also has a built in way for devices, not simulator.

• Just go 'Devices and Simulator' (cmmd+shift+2)
• Select your device
• Scroll down til you find 'Device Conditions'
• Set your desired profile
• Hit Start

To have this working you need to install 'Network Link Conditioner' on your Mac. See steps mention in Alan's answer

There isn't a direct way to emulate a slow connection, unlike, say, the nice network connection emulator that blackberry developers enjoy. However, since your simulator's connection goes through your computer - you can simply focus on slowing down your computer's connection.

You'll want to achieve two things (depending upon your circumstances):

• throttle your bandwidth
• increase your latency

Maybe this will point you in right direction:

http://www.macosxhints.com/article.php?story=20080119112509736

There are some good open source solutions, too, but I so can't remember their names.

This question might help: https://stackoverflow.com/questions/2273839/how-to-throttle-network-traffic-for-environment-simulation

I would argue that a slow connection isn't enough to simulate real-work mobile data network behaviour - since there is also much more packet loss, higher latencies and more dropped connections too.

Here is a handy script to configure the firewall to emulate these parameters:

http://pmilosev-notes.blogspot.com/2011/02/ios-simulator-testing-over-different.html