Input Lag in some games

[Zenhart]

Hi guys,
So I found a little problem here while playing MHFU and I notice sometimes a input lag when playing. For an clear example, everytime I move my character forward he stops and then he back to walk forward like the game stopped to register when a key pressed to move. Same happens when I try to unsheathe the weapon or try to attack. This input lag is worse in MHF1, MHF2 & MHFU, in MHP3rd it happens only a little bit, and don't disrupts while playing.
I use a Xbox 360 Controller, and I noticed that it don't happens frequently on Keyboard.
What should I do? Thus is really annoying and disturbs the gameplay

ps: Sorry for the bad English, hope you guys can understand me.