>>Hi,
>>
>>A customer sent me a questionnaire where on question is:
>>Will application run with 20-30ms latency?
>>
>>How can I test and determine this? Do you (companies marketing VFP applications) typically test this?
>
>That's an ambiguous question. I can think of at least 2 interpretations:
>
>1. Will the application function properly on a network where the TCP/IP host to host latency averages 20-30ms? The answer to that is "probably yes". Since LAN latencies are typically in the order of ~1msec, a 20-30msec latency implies a MAN or fast WAN. As long as that network does not have any latencies long enough to cause your app to time out on a connectivity error it should be OK.
>
>2. Some operations such as high frequency share trading require very fast response times. If they're asking "will your application always respond to queries in less than 30ms" then the answer is no. Even if your application is very fast, it's still dependent on the network and servers at the client site; you have no control over those.

First, thank you for your message. I will have to Google for understanding the term "latency" as it applies to the application. The reason the customer is asking this is that they are thinking about moving my VFP 9 app to the server in another state (I am in Massachusetts and the server will be in Penn state). And they want to be sure that the physical distance will not be a problem.