I think it is a design flaw/choice to only transmit every 15 seconds or so, instead of every wager being transmitted instantly. This probably had to be done this way 10-15 years ago when simulcasting was made available nationwide to all tracks/OTB and the technology/bandwidth wasn't available to be instantaneous.

I'm an EE/CS and design applications with ethernet communications between Windows CE and industrial controllers. I'm sending/receiving 1000 bytes of information and updating the Windows CE display in 50 milliseconds.

It comes down to cost like anything else and if everyone thinks it's acceptable the tracks won't change/pay to have the system upgraded. Thats my opinion.