Maintenance for the week of October 6:
• PC/Mac: No maintenance – October 6
• ESO Store and Account System for maintenance – October 7, 6:00AM EDT (10:00 UTC) - 4:00PM EDT (20:00 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!