missing info 30 fps drop as E2C powers up - costly prop animations?

[Boosterdog]

Ive been going over some older missions on the SC. Since getting my new puta, Ive been able to sit quite smugly with many max'd things of lovelyness whilst sitting comfortably above the 60 fps needed for vstink. Today, whilst checking the mission for a little added airboss audio, I gazed lazily from my parked Tomcat on Starboard elevator toward the Hawkeye preparing to depart from Cat3 when, to my chagrin, , the fps plummeted from a stable 84 to 48 as it opened up its throttles before returning to the 90 mark once it had left the boat. 

Thinking it may have been the heatblur, I disabled it to no efffect. 

Moving the Hawkeye to Cat 2 and futher away from me keeps my fps stable and in the mid 80s, with or without heatblur. Shove a jet in Cat 3 and there are no issues either.

So, in my dull mind Im thinking "has something changed with the prop animations recently?". I cant recall ever seeing an issue previously (and Ive run this mission many many times). A 36 plus fps loss whilst opening a throttle seems awfully costly. 

I'd  post a track but the mission is modded since the SC is so under endowed with deck equipment and theres a C2 and some better HH60s in there too.  

Anyone else expereinced this? 

[NineLine]

We will need a track, and it needs to be a track that is unmodded to make sure that isnt part of the issue.