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@xianc78 Are you not managing changes in the game relative to a dt? Having your logic advance statically per frame isn't a good idea

Monogame should be giving you something like an update(dt) callback that gives you the deltatime (time since last frame, rendering + vsync)

All you have to do for slow motion is to have a multiplier for it

player.x = player.x + (player.velocity * player.speed * dt * speed)