After having some troubles playing VRC, I started to look at my hardware to see if there was some gains to be had there because while I’m not a great racer in real life, I’m also not terrible 😎 I wound up doing a lot of research regarding the relative speed and latency of various tx/rx brands and models. The most concrete measurement I could come up with is the PWM frequency sent from the receiver to the ESC & servo(s). PWM signals are often must faster than PPM signals that are used by buddy-box or direct servo control systems. This is important in regards to playing VRC.
I gathered results measured by myself and others using the SkyRC Program Box. It is not a foolproof measurement of end-to-end latency – the delay from when you give a controller input and the ESC reacts to it. But it’s a clear metric, and part of the overall latency we can measure easily.
Much of this may not even matter to you. The average human reaction time is on the order of hundreds of milliseconds. For transmitter latency we’re talking about tens of milliseconds or less. Also, the transit time on the fastest servos are around 50 milliseconds, so that is another part of the equation that is difficult to reduce. But just because the measured latency is less than what we as humans can react to, it doesn’t mean these delays can’t be perceived, even if it’s just in the way something feels.