Slower than version 1.2 when moving canvas

Hello,
Thank you for your effort, i just downloaded a nightly version, and it has beautiful interface, just few things I noticed that the canvas is much slow when I move it, even if I turn off the "Antialiasing", and also switching tabs are slower.

Synthesizer does not save soundfont when I start Musescore next time, also it seems it saves with file, I wish it has general soundfont support like v1.2.

I am using windows 7.
Thanks.
Good luck & Blessing
Shylon

GIT commit: 4d17135