[Kevin Sevcik]

This is as fast as the master processor gets a full data packet from the radio modem. Consequently, you won't get updates from your joysticks any faster than that, so theres little point in updating the user processor faster than that for most things. Why so long between packets from the radio? The modem runs at 19200 bps. That's all. Not coincidentally, that update makes for about 512 bits per update. Just 64 bytes of data per packet to carry: 4 joysticks at probably 5 bytes each, plus team number and channel info, competition control data, presumably checksums and/or error correcting info, stuff I haven't thought of, and possible room for future expansion.

So, mostly, the update is that fast because that's as fast as it can reasonably be made and still get data everywhere it needs to go.