gnome3 is slow on fresh install (kde4 and xfce run smooth)


I have fresh install with intel driver (i915kms loaded) and no problems with kde4 and xfce. But gnome3 interface stutters and I've found no obvious reason for this. Please help.
From /usr/ports/x11/gnome-shell/pkg-message
Gnome-shell requires acceleration of to work. For this a nvidia card
with the nvidia-driver, or a Intel/ATI KMS enabled card is needed.

For the nvidia users no other changes are needed. For Intel/ATI KMS
driver the user needs to have read/write permissions on
/dev/dri/cardN (usually N=0). If gnome-shell is launched from gdm, the
gdm user also needs this access.

Access can be granted by adding the user(s) to the video group.

Additional for FreeBSD versions before FreeBSD 11.0-CURRENT revision
286524. And any FreeBSD 10.x version and FreeBSD 9.3-Release.

By using a devfs.rules(5) to change the mode of the /dev/dri/card0 on creation.

add path 'dri/*' mode 0666 group video