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In the Activity Monitor app on your Mac, click Network (or use the Touch Bar) to see the following in the bottom of the window: Packets in, Packets out: The total number of packets received and sent. Packets in/sec, Packets out/sec: The speed of information being transferred (in packets per second).
What is Fiddler Everywhere? Fiddler Everywhere is a secure and modern web debugging proxy for macOS, Windows, and Linux.
There's the more general but perhaps not as helpful to you Wireshark.
One of the SO server sites might be better suited for your question. In fact, it's already been asked on SuperUser.
Charles is written in Java and runs on Macs. It's not free though.
You can point your Mac at your Windows+Fiddler machine: http://www.fiddler2.com/fiddler/help/hookup.asp#Q-NonWindows
And as of 2013, there's an Alpha download of Fiddler for the Mono Framework, which runs on Mac and Linux. Also, the very latest version of Fiddler can import .PCAP files captured from WireShark or other tools run on the Mac.
If you don't get any direct answer to this you could always run Fiddler on a windows machine and configure your browser on the Mac to use the windows machine as a proxy server. Not very satisfactory and requires a second machine (although it could be virtual).
HTTPScoop is awesome for inspecting the web traffic on your Mac. It's been incredibly helpful for me. I didn't think twice about the $15 price tag. There is a 14 day trial.
Cocoa Packet Analyzer is similar to WireShark but with a much better interface. http://www.tastycocoabytes.com/cpa/
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