I guess this may be a repost, but I'm using a very good pc(i7-4720HQ, 8gb ram, gtx 950m 4gb) and after I enter my password is taking like 1-2 min for dock and wingpanel to show up. Does anyone know why is this taking so much?
This is a bug with DBus - see the answer I posted here.
Essentially DBus is preventing everything from starting up, so until that's fixed you need to rename the file causing issues:
sudo mv /etc/xdg/autostart/at-spi-dbus-bus.desktop /etc/xdg/autostart/at-spi-dbus-bus.disabled