I have published a couple of exports on the New UX. However, they take a lot of time in completing the export. There are times when it takes almost >30 seconds for a 3/4 MB export. The same export when run from within the model is much faster. Is this a New UX issue?
There shouldn't be a noticeable difference between an export from the module and an export using an action in New UX. Is it possible there was some contention? Meaning, was it possible that someone else was running a different process? This will certainly slow it down.