I'm trying to edit and object and the mouse (I'm using a trackpad on a macbook pro) literally flounces: if I try to grab an object I may move the mouse for many blender units, but the object doesn't move... at a certain point if I keep moving the mouse the object moves but too fast. It literally moves at steps, the movement is not continuous. I registered a video to make this clear. In the video I press G to grab the object, and like you can see the movement is not continuous, but it just makes a huge step after that I dragged the mouse for a while.
If I create a new project I don't have this problem anymore, it seems like there's something wrong with my project settings or my objects.