Sudden performance loss

My project was functioning perfectly until I decided to increase my scalability settings to epic across the board, Obviously I took a hit in performance which is to be expected. However, After readjusting the settings back to medium and high, the performance stayed as if everything was still in Epic settings.

Things I have tried:
Trashing Saved, Derived Data, and Intermediate folders
Deleted the sun, atmosphere, skylight, fog, post process volumes and skysphere one by one.

Even with all of those things deleted the performance drop (up to 50 frames in some spots) still persists.

We have a demo due for a publisher and any help at all would be greatly appreciated