Breach problem

I have a problem with breach especially in open area : When I enter in a breach I am immediately suround by 10-15 enemies and no one take any damage, few second later I have 50 enemies around me and I am unable to kil any monster, no one take damage, so it result by a death without any option to survive.

It appears every time in open area and not often in close area, so I imagine it's a performance issue due to the very high density the breach have (on my last death screen, I saw 108 monsters on the screen).

It looks like the game can not run with this kind of density.