I dont know if attaching my logs would help but this problem doesn't change whether im on the ground or in the air but every 10 seconds or so my game goes from a nice 120 fps to 30 and then back up and I've tried tweaking with a bunch of settings, setting it to low, low preload, turning SSAO, SSLR off and nothing seems to help.
cef_log.log
dcs.log
dcs.log.old
debrief.log