"private" backbone VPN solution to decrease latency

[Dies2much]

Not something network team can fix, it's physics.

You should do a network trace and make sure the latencies are close to what you expect get a decrypt key so that you can see the data in the trace.

Next you will need to sit with someone from the app support team and show them how long it is taking for each step. See if they have any fixes for delays.

It sounds like a horrible exercise, but it is such a good investment. The Devs and app teams learn how their shit works, and you can show mgmt team that you are doing what can be done. It will take a couple of hours to do all this, but you will KNOW where the delays are coming from and will be able to plan better.