Help. I get horrible lag with the new launcher on any versions.

Put the summary of the bug you're having here

I get horrible lag with the new launcher on any versions. I do not have dedicated graphics card. I got 80 to 250 fps with the old launcher. now i get 5 to 35 at best. my computer is a toshiba sattelite L855-S5371.

*What I expected to happen was... minecraft would run the same speed with the new launcher.
Describe what you thought should happen here
I would not have any lag problems because i have a decent computer.

*What actually happened was... I got so much lag like i have never experienced before.
Describe what happened here

Steps to Reproduce:
1. Open minecraft with my computer.
2. start any world or server.
3. ...