How can I monitor the FPS in OSX?
The tool being used in the screen shot is "Quartz Debug"

It is part of Apple's free Graphics Tools for Xcode.

To get this app:


download Xcode from the Mac App Store.
Open Xcode and select Xcode > Open Developer Tool > More Developer Tools...
This takes you to Apple's developer download site.  You will need to register a free developer account to proceed.
Select "Graphics Tools for Xcode" to download a disk image with the tools.
Open the dmg and you can copy out "Quartz Debug" to your computer.


Running Quartz Debug should show the FPS meter.  It has various options which allow tweaking of Quartz settings.