Why does Stockfish 13 have faster NPS than Stockfish 16.1 on an Android smartphone?

[ramiroflores]

I used both Stockfish 13 and Stockfish 16.1 to analyze some positions from the engine testsuite file, and Stockfish 13 had more successes than the other one under the same settings.

Also, I noticed a difference in speed (nps); Stockfish 16.1 is 20% slower.

[Werewolf]

The larger the evaluation function (a NNUE file in both cases), the slower the engine will go.

As time goes by these neural networks tend to get bigger