javaw.exe runs twice as a process

After starting Minecraft the javaw.exe is open twice as a process. The second one is from the launcher and the "Close launcher when game starts" option is set. If I stop this javaw.exe the ingame lag will go back down to normal, therefor it seams that this javaw.exe creates lag.

What I expected to happen was ...:
That after starting the game the javaw.exe from the launcher stops.

What actually happened was...:
The javaw.exe runs along with the second javaw.exe and that creates lag.

Steps to Reproduce:
1. start your laucher.
2. start Minecraft
3. open up your task-manager
4. go to Processes
5. there you will find 2 running javaw.exe
-CPU around 00 (Launcher)
-CPU around 05-60 (Minecraft)
(6. stop the launcher javaw.exe and enjoy the game)