Im playing on a ps4 with mouse and keyboard too and have made the same experience.
On the pc i would know how to switch the "lagging" but on the ps4 i cant toggle the mouse (since u normally cant use a mouse with the ps4) and ingame i havent found a corresponding setting.
Anybody know if theres a hidden switch in the settings in ff14, where u can change the speed of the mouseicon on the screen?