The current Fiddler Everywhere rules do not allow you to simulate modem like you could do with Fiddler Classic. 

https://www.telerik.com/forums/can-fiddler-be-used-to-throttle-an-android%27s-or-iphone%27s-network-connections

I want this functionality brought back so I can do things like we had in the old Fiddler:

Fiddler includes a Custom Rules Engine that can simulate throttling. To enable it go to Rules -> Customize Rules... or (CTRL + R) and set the m_SimulateModem variable to true. 

The script that executes when this is true is as follows:

if (m_SimulateModem) {
    // Delay sends by 300ms per KB uploaded.
    oSession["request-trickle-delay"] = "300"; 
    // Delay receives by 150ms per KB downloaded.
    oSession["response-trickle-delay"] = "150"; 
}

I have tried Delay Request but it's not the same:

Originally reported here: https://community.getfiddler.com/support/discussions/topics/12000026504