I can't find any data on how fast the different brands are. I just upgraded from a lame Turnigy radio to a Ko Propo EX-2. Holy Crap! So much better. I've read that the receiver from the EX-1 is even faster. None of the manufacturers that I've researched seem to list the speeds of their products. Is there a place that has a database of this info?

In the Sanwa product book they have listed some brands/models to compare.

Google the radio's brand name with "radio latency" and you should get all/most of what you're looking for.

You also get to a point of diminishing returns. Radio latency is in milliseconds (1/1000 of second), servo speed is in centiseconds (1/100 of second).

My opinion: If you have a good radio, going to a lower latency radio is probably not going to make a difference. Lots of studies on how our brain adapts/predicts and overcome our own natural latency.

I agree Gerry

To add to that just make sure your Latency is less than 10ms and I don't think you will have a problem. And important too is the quality and speed of the servo.

Milliseconds is very noticeable especially if you are a musician and know what latency can do to your music while recording.

My DX4S's 11ms or whatever it is, is very slow in response compared to my 4PKS-R.

a 3 millisec latency on a framerate of 20 milisec is pinuts because on the most worst moment you have a latency of 20+3 = 23 milisec

With a framerate of 4 millisec (FASST) is is back to 7 millisec.

Framerate is getting more important, The Futaba PLS is doing 2.9 ms frame and the new Sanwa 2.23 ms, that last is sending 8 to 9 times servo information compared with a normal 20ms frame transmitter.

To put this in perspective, a mod TC geared for a 100ft (30m) straight will do 80kph (48mph), that means the car will travel 0.5m (18in) in 22.5ms.......