Just to clarify how the signal travels and what parts that are involved i want to type this chain of components. Understanding all steps will clarify that when manufactures claim they have made something 50% faster they are always just talking about one of many parts in the chain. And numbers they post that their radio delay is just 1ms, they are probably just talking about the delay in the TX module ignoring the delay in the RX module or any Radio and Receiver software. The key to getting knowledge is to question the data and claims.

Physical steering wheel/stick -> Potentiometer -> Signal filter -> Analog to digital converter -> Radio software/hardware -> Radio TX module -> Radio signal in the air -> Receiver RX module -> Receiver hardware/software -> Signal output to servo

Comparing the GT3B that have the hacked firmware you can see that they have managed to cut out 16ms from the radio software making that part say 100% faster, but the overall chain is just 40% faster because what happens in other parts.

Also a reason to why I end the time measure after the servo signal drops to 0 is because I think that if you want to push delays to a minimum you can change the state during the time you already have started to send the servo signal, because every signal is starting with 1ms of "header" and during that time if new information comes in you might be able to extend or shorten the pulse if there is enough time. I don't think any manufacture does this but it is possible so that is why I want to measure this way. Lets just say that if I was a s/w designer I would do it this way.