You can get a 0 FPS and level lock up on any system. I have a massive system with little crap for its size and capability and it has happened to me due to the Lagg or memory leak bugs.
Quarentine the offending tile(s) i.e. redesigning the level so you cant access that part (tiles) of the level removes the problem.
Having said that - If FPSC is telling the truth anyone who has got 100k ploys in view would certainly have a problem. For whatever reason 50k is the recommended limit though I have well over 60k which is too many for FPSC. The Lagg bug though is nothing to do with the real number of polys as FPSC tells Porky Pies and gets a little confused as to the polys in view from one tile to another.
As far as I can ascertain and I dont know whether it should do so, in many locations - it reads all the polys even through walls (even if you are tight faced to a wall touching it so you cant see anything else) and around corners.
For sure you cant have too powerful or a too efficiently running a system for using FPSC.