Fraps
Fraps is a computer utility for calculating the number of FPS
...It functions primarily as benchmarking software, displaying real-time frames per second (FPS) in a corner of your screen and allowing you to measure performance between specific points. The app saves these benchmarking statistics to disk, making it useful for reviews and performance analysis. Fraps also serves as a screen capture tool, enabling instant screenshots that are automatically named and timestamped without needing to paste them elsewhere. Additionally, it offers real-time video capture capabilities, letting users record gameplay at resolutions up to 7680x4800 and frame rates between 1 and 120 FPS. The captured videos maintain outstanding quality and support synchronized audio recording. ...