We use it for all our front-end infrastructure, AWS for all our backend infrastructure, the front-end devs prefer DO and can consume an API created by back end devs on AWS.
I couldn't tell you technically as I didn't build it, however, I use our app and it's very quick, I know that we keep our regions near each other (east east), front end can fail through nyc locations, we have no customers outside of the east coast either, so that helps as well. As far as back end, we are restricted to AWS GovCloud regardless.