Unity WP8 Better Performance When Connected to Visual Studio

First of all sorry for the very long title.I couldn't find a shorter way to describe the problem.

I am experiencing a weird issue while testing my game on Lumia 520.

Here is how it happens;

First i Build the game from unity as WP8 project as usual. a : Than i build and run the project from Visual Studio (on device) as "Master" build. b : Cut off the connection of phone and computer.Run the game again(the build i took before) without connecting to Visual Studio.Performance goes down to 3-5 fps.

Note : If it were the opposite situation i would understand completely and i would say ok debugging making the game slower,but in my game debuging from visual studio-somehow- makes the game run faster.(actually makes it run at the expected speed.)-

Update : I can also replicate the problem if i choose Run without Debug from Visual studio instead of Run and Debug.-Run and Debug is faster,normal speed-