I don’t know if anyone else experienced this, but when I upgraded my project from 4.7.6 to 4.8.0, I got an out of memory issue. The editor will load assets up to 91% complete and then some sort of infinite loop happens and the memory usage climbs exponentially until it maxes out, and then the OS starts to desperately page out memory to make room for more… and the computer freezes and requires a hard reboot. Reverting to 4.7.6 fixed the issue for me.
So… Make sure you backup your projects and save all your work before migrating to 4.8.0!