Earlier this year I mentioned a simple library allowing you to easily track the time required to execute an objective-c method.
Here’s another library providing an easy way to track the performance of an app from Rolandas Razma called RRFPS.
RRFPS provides a simple means of tracking the Frames per second of an app and a chart of that frame rate all conveniently placed within the status bar area.
You can find RRFPSBar on Github here.
A nice simple way for tracking the frame rate of an app to help improve app performance without the need to use instruments.