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The big performance difference is 100% to be expected — it’s the wrong expectation to see anything comparable. Practically, you’re comparing the machine on your desktop and a desktop from the 1990s, so there’s no discovery to make there other than that there is much less horsepower and RAM available for your iOS task.
I will check out your logs. The alphabetization issue could be important because it is part of the specification for the dictionary and the ARPA model that they are alphabetized. It is something that could be a speed issue on the device, because the desktop performance will be basically realtime which means that you won’t notice anything that negatively impacts performance there. What could be happening is that the search method is supposed to short-circuit once it goes beyond the alphabet range, but it can’t because there is no predictable alphabet range for your model so the whole thing has to be searched for every search path. Again, you might not see any issue with this on the desktop because it is all happening so quickly that de-optimizations don’t show up in real usage.
I again suggest that you check out a similar English model on the device so that you can see what an average speed response is. For the days of the week in English, I would expect a near-realtime response from OpenEars after the obligatory silence detection period.