In one of my libraries, which contains approx 100 DOI entries, having the shortDOI field formatter active noticeably slows down the time it takes to save the library.
It takes <1 second to save without said formatter, but 30-40 seconds with, during which JabRef becomes unresponsive. This happens on every save, even when all DOI fields are already in the shortDOI format.

If I interpret the above pieces of code correctly, the formatter always makes a request to the shortDOI service, even if the DOI is already shortened. Would it be possible to first check if the DOI is already shortened (i.e. starts with "10/"), and only make a request if it is not?