Yes, I noticed the same stretched backgrounds in loading screens.
My graphics drivers are all up-to-date, I use the dedicated NVIDIA ones. I play on high settings (GeForce Experience recommends even playing on highest settings on native resolution (1920 x 1080) but that might be a bit much IMO) and there's almost no lag at all, switching between saves takes a crazy fast 30 seconds to load...
I've noticed that the game is loading more slowly since the last Origin update, but that's all. It looks like Origin sends more data than before so it reduces game performance but I don't think it could have any real influence on graphics in game ? It's a bit frustrating and I wish I didn't install the update, but I can't say that I've noticed much lag other than during loading screens.