Asynchronous TimeWarp (ATW) can mask latency and judder issues that would normally be apparent. To help you identify when your application or experience isn’t performing and to test your game or experience before submitting it, Oculus provides performance indicators.
When enabled, a letter code appears in the upper right of the headset whenever the application is experiencing a performance issue. The following figure shows an example of a performance indicator with L and F displayed:
To enable the Performance Indicator, start the Oculus Debug Tool, which is located here:
Set the Visible HUD option to Performance:
The performance indicator can return the following codes:
Each warning lasts one frame. So, if L stays visible, the application is having continuous latency issues.