Latency with Ademco Vista128 + AlarmDecoder binding?

Hardware Home Automation
1

Looking for data, either anecdotal or actual measurements, on the latency and response time of sensors in the following configuration:

Hard-wired door closure contact --> Honeywell Vista128 alarm system --> AlarmDecoder rs232 serial device --> OpenHAB server.

Assume all items are optimized and the OpenHAB server is running on a dedicated fast computer, i.e Intel Core i5 / 4GB Ram / SSD on SATA bus.

When a contact changes state from open to closed, how long is it before the OpenHAB server sees the state change? 10 milliseconds? 100ms? 250ms or more?

Thanks for your detailed replies.

2

Predictable and bounded latencies are not an openhab feature. I would guess median to be 1sec.