It seems to be not too problematic as it is into SH III.
I think so the FPS droop is caused by the fires/flames sounds not by the fires graphics...
It is not so problematic into SH IV... and i am not runing a top end computer, PIV 3.4 NothWood, 3GB RAM, ATI X800 XT PE AGP 256mb, and it cause a samll FPS droop but i can pl;ay with no problem with all background programs opened, antivirus, antihacker, antispywares, more than one...
I think so there will be not problem to bring back the effect into SH IV.
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