How can I average the framerate between two points?
While in the game press the key you assigned to the Benchmarking Hotkey. This will mark the start of where averaging is to take place. A green box is displayed to let you know that logging has begun, and then the counter is removed for maximum accuracy. When you want to end the benchmark, press the Hotkey again. The average framerate will now be displayed in a red box. Full details are also saved in the file FRAPSLOG.TXT in your Fraps folder, and into the benchmark directory if you have detailed statistics enabled.