Slo Mo here too
I've got the same issue. Everything mid-game suddenly slowed-down three-fold. 10 secs on any space station clock now takes a suspiciously-exact 30 secs of real time. All of the game menus and gameplay similarly slowed. Even the solo combat tutorials. Makes me able to do awesome Matrix-like stuff against computer ships. Restarting, reinstalling, changing graphics settings... none helping. At first, I thought the graphics card had fried, but all seems OK. It's all still smooth... just slow motion.
Sent a support ticket, and I'll see what happens.