Since I have not played Street Fighter V, I looked for a YT video of it, and watched this one: youtube.com/watch?v=btWQBO6awaU .
The slow feel could certainly be an issue with it running on Linux. Here is a short video of me in Training, so you can see how slow everything feels, compared to the fast paced fight I linked to above. I did not do any particular moves and mostly just tried to do some basic moves, which, from my understanding, should be the quickest. The feeling of a long pause I was talking about was not after or when starting bigger moves, but for all moves. Everything just feels like there is a bit too much of a delay between the moves. I like your inclusion of details for debugging, such as showing the inputs, as we can see that it is getting the inputs as they are pressed. Seeing the inputs showing up right away is why I assumed it was the game pacing, but there could be something else in there that prevents getting that faced paced feel I associate with fighting games. https://www.dragonsisle.com/other/TouhouMusouRoku-SamplePlay.mp4