Great map concept ruined by unplayable fps drop

The campaign  is excellent. Great design, soundtrack and effects. Clearly some parts recall Silent Hill. 
The main problem is the fps drop resulting in pings above 200 and consequent lag and teleports. I happens mainly in the two first levels, practically unplayable, but since we liked the custom, we went ahead. From third level on this problem lowers, and gameplay goes to normal.
Solving this problem, the campaign would be one of fumiest out there.

---Team WheelChair---