Maintenance for the week of March 16:
• PC/Mac: No maintenance – March 16
• ESO Store and Account System for maintenance – March 18, 6:00AM EDT (10:00 UTC) - 4:00PM EDT (20:00 UTC)
I haven't played yet today, but keep in mind that sometimes server stutter/ connection can feel like graphics/ frame rates. Maybe try restarting the game or lowering AA/ effects to see if it betters it for diagnosing.