I noticed the Blast Processing patch actually. There was a slight increase in random half-tile teleporting that always seems to happen when next to Shadow Fire, but in exchange I could run graphics on High and render effects with far better performance than my previous personal best of 1.5 minutes per frame.
But I wouldn't mind some lower levels of graphics. Actually... I would prefer some levels of graphics between low and medium (and by extension, between medium and high). For example, the main reason I suffer through a bit more lag than usual is because I like the lighting effects from (destroyable) torches and to make my Quicksilver Mail shiny. However in FSC, any graphics higher than low causes Shadow Fire to go CRAZY and lag me so much.
If you meet minimum requirements it shouldnt lag that much.