LST is a UE4 "game" which tasks you with choosing between two randomly presented scenes: one with no lag added, and one with a user-configurable amount of latency. Each test is composed of 16 trials. If you can correctly choose the high-latency scene at least 13 out of the 16 trials, you can be confident that you can feel a real, perceivable difference at that latency setting. If you successfully complete a test, lower the added latency and try again. Once you can no longer score 13/16, that will be your sensitivity threshold.
What is your threshold? Share your results!
Download latest version of Aperture Grille's Latency Split Test
Setup:
- Run in fullscreen or borderless mode. V-Sync is off by default.
- Cap frame rate to exactly 1000 FPS (1 ms frame time).
- If frame rate is under 1000 FPS, lower rendering resolution until 1000 FPS can be held continuously.
- Use mousewheel up/down to increase or decrease the added latency.
- Spacebar to begin test (or end test prematurely). Latency cannot be changed during a test.
- Right click when mouse is stationary to swap between A and B.
- Left click to select what you believe to be the high-latency scene.
- Decrease the latency until you can no longer correctly guess at least 13 out of 16 trials.
If you have any suggestions to make this program better, or if you encounter any bugs, email Ashun.