For the grub lagging, try this: sudo nano /etc/default/grub GRUB_GFXMODE=1280x800 sudo update-grub
If this doesn't fix it you can try another resolutions.
For the grub lagging, try this: 1280x800
sudo nano /etc/default/grub
GRUB_GFXMODE=
sudo update-grub
If this doesn't fix it you can try another resolutions.