Maintenance for the week of November 17:
• PC/Mac: No maintenance – November 17
• ESO Store and Account System for maintenance – November 17, 6:00AM EST (11:00 UTC) - 4:00PM EST (21:00 UTC)
• Xbox: NA and EU megaservers for maintenance – November 19, 4:00AM EST (9:00 UTC) - 12:00PM EST (17:00 UTC)
In addition, you should ensure your video driver is selecting the correct GPU for ESO by opening either the NVIDIA Control Panel or AMD Catalyst Control Panel and ensuring that ESO64.exe is making use of your primary GPU.
Download Windows updates
Download and install the latest version of DirectX here.
The FPS loss is due to major memory leaks players have reported over the last 2 years. Don't be fooled by what zos Billie said, it's a standard protocol and zos refuses to fix the memory leaks cuz they prolly have no idea how!