The delay often comes from
1. too low rotation speed, set the Rotate speed of Pathfinding to something like 360 * 4
2. too small cell size, try to make your cells as big as possible
Setting rotation to high speed worked!
But, there is several of other issues:
1. for some reason object cuts corners, which tells me that polygoal collisions are not taken under consideration, right?
2. It is easy to break the behaviour, where when object is doing corner, you keep on clicking, then it will get stuck on it.
3. There are still weird movement bounces, when object is next to the wall, and you change its direction, by clicking anywhere opposing to its movement.
4. when object moves next to a isometric wall, it slightly bounces.
capx http://drive.google.com/file/d/0B0jUjWN7LcQhbGE5STVXNUNoX2c/view?usp=sharing