Every Time the Beast Hits Me… My FPS DROPS

Every time the Beast hits me in Flee the Facility… my FPS gets WORSE. One tag = instant lag. Two tags = slideshow mode. Three tags = I’m basically playing on a potato. I tried to escape while my frames kept dropping lower and lower, turning the whole map into a dark, glitchy nightmare. Can I survive the Beast while my game falls apart, or will the lag finish me before he does?