What do you mean by delay: Is there a delay from when you are pressing the X and Z button to the in-game response? Are you using a keyboard that comes with software or discord overlay/overwolf, etc.
Are you simply not skilled enough to actually hit the buttons fast enough.
uploading a video of this behavior would be preferred so we can see exactly what is happening. Very hard to diagnose and help fix when we are given 1 sentence with no example or information.