I'm breaking in a new Samsung 4K monitor, and wanted to check my Frames Per Second (FPS).
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Thankfully, Apple have a tool for that ....
I went to developer.apple.com specifically here -> https://developer.apple.com/download/more/
and chose Additional Tools for Xcode 11.4
Amongst other tools, we have Quartz Debug
This includes a Frame Meter: -
Via the Window menu: -
So I'm getting around 30 FPS
The Mac is connected via an Anker USB-C hub
I'm going to tinker with other options, including USB-C to HDMI and/or USB-C to DisplayPort cables .....
What fun!