This glitch allows you to pause before Umbra. It takes a bit of time because you have to restart the game, but it could potentially save time because it allows for using different oculi during Nox and it also allows you to get the last skill levels.

How to: Exit(Alt-F4) the game during the Robert/Margaret conversation. You'll notice that the game autosaves here. When you load the game you'll be back in the same conversation. As soon as the conversation is over hit escape. Done.

Tested on PC

A faster Oengus skip. Saves about 20 seconds over the old strat.

How to: Enter the room where Óengus leaves you(where his sidequest is) Exit the room Trigger the save just before Cordelia Exit to menu Load game Done. Óengus should now be in your party : )

Here's a video of how to do it:

I have only tested this on PC with steam/uplay. I don't know exactly why it works.