FPS

Nice idea but it would be more useful if all of the FPS code was 100% contained in the Counter actor because then it would be easier to port and use in different scenarios.

You're right there, I think I'll make a second version where it's all in the counter actor. I'll also slow the thing down, at the moment you can sometimes barely see it when it changes so quickly!

You could always implement different counters. Sometimes you want the realtime framerate which is calculated on a per frame basis (useful for when your getting spikes in the frame rate), other times you might just be interested in an average frame rate over time and I personally literally count how many frames (or more accurately acts) occured in a second and then update the value (so it only updates once every second rather then in realtime). You might even want to go further and record the FPS to disk so you can compare the change in a frame rate over time (I used to do this with a program I made that displayed given frame rates as a graph). Very useful for testing new optimisations and code that could potentially add more overhead. You could try implementing all of these and any other alternatives people might find useful when profiling their scenario. This scenario could then try to be more of a 'do-all FPS all-in-one' scenario.

Nice - I'll throw up a simple version with a couple of corrections to start with and in the future look to do something a bit more complicated like that :)