So I flew from Belfast City to East Midlands last night, Whilst en-route I noticed some storm clouds ahead ( Well I seen lightning anyway) then All of a sudden my FPS went from 55 to a locked 19 FPS again, No matter what I did ( Lowered cloud distance and that didn't help) In the end I disabled SMP and I got my FPS back again. So I know 100% there is something wrong somewhere.
PC Specs: I7 6700k @ 4.5ghz, GTX 1070 SC, 16GB 3000mhz ram.
Log is attached from last nights flight
Log.txt