Steps to reproduce
Head to 1.5.2 (on the launcher) and join a server
Record FPS
Then join a 1.5.2 server on the old launcher and record FPS
The new launcher will have far more lag
Related issues
duplicates
Comments

Blind guess, you are playing on a laptop with integrated graphics rather than your discrete videocard. Add java.exe to your 'exception list' for programs wanting to use discrete gpu pow.

k kl thnx, also my bug report MCPE-2339 has gone unchecked for over a week now, someone please check it

and yes i am playing on a laptop, but this is Mac
Yes so? Typically a mac still has two videocards and there is no 'good' way to define which application wants a 'high performance profile' or not.
Download GfxStatus: http://gfx.io/ and you will gain full control.
No, cannot confirm.
Please provide more information as "Launcher 0.7".
With both the old and new launcher: Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here
Suspecting duplicate of MCL-225