I've been using FPse on Android for a while, and hhile most games work flawlessly, Diablo has a huge input problem. It does not seem to lag (FPS is steady 50) but playing is flaky - some button presses just do not get processed. ePSXe has no such problem with Diablo, but it has very bad sound issue so I would prefer to play in FPse, but this problem needs to be fixed first.
My device is Galaxy Note 10.1, Android 4.4 Kitkat.
This problem can be reproduced in any place of the game, even start menu - start pressing arrow down at a steady pace to scroll around menu and see how some of your presses are ignored, others processed with a delay. I have also tried using external gamepad - same result.