openmw.org

South Wall Den of Inquityhttp://mw.modhistory.com/download-15-13449

Entering the South Wall with this mod enabled drops my FPS from 60+ to 2 or 3. When I press F4 (?) the Physics bar goes crazy. Does anyone know any fix to this? Or what is causing the issue?

https://bugs.openmw.org/issues/4098 and https://bugs.openmw.org/issues/3803
The short answer: animated "sitting" characters are the cause of slowdown.
Vanilla game does not handle collisions for them since thery are not moving.
For now, the simpliest fix is just to remove these characters.