PhoenixTril

Plagued by exactly the same issue here. Behaviour crops up with ATM, does not crop up when ATM is removed. Similar list of mods, but I took out a bunch without affecting the issue.

I love this pack. I wish ECLSS didn't have a terrible monopropellant bug, otherwise I'd be able to use the hyd/oxy stuff for its intended purpose instead of just fuel cells.

Your Mystery Goo Jr. Container model causes a drop of 10-12 FPS anytime it is present on screen. Your other instruments are fine, but the Mystery Goo Jr's model has something wrong with it. I replaced the Mystery Goo Jr. with another model and I no longer had lowered FPS when I put it on my ships.