[2019] UPS, Biters, & 17.70

First off big shout out to the Devs for all the quality work so far with Factorio. That being said.. since the latest 17.70 patch with the non colliding biters I have noticed on my mega factory that once biters get into the thick of things with my defenses my UPS will drop 10-15ps. Its not before they hit the defenses but seems to happen as soon as they run into the wall of fire from my flamer turrets and it lasts until the last bug dies. It feels like its maybe the flamers fault and not the bugs but I cant be for sure. So far I've only tested this on my mega base and I've confirmed that its not the laser turrets or mines as this can happen at places where I do not have either of the them. It seems to start when the flamers start spraying and like I said finishes when the last bug dies in the fire. So far I've watched it when waves of 20-40 hit my wall.