Significant FPS Drop during night strike after target explosion

[8kidd8tv]

on the left top of the each picture you can see the FPS

 

1st picture is Before dropping JDAM. I had 60~80 FPS

 

2nd picture is the moment right after the bomb hits the target. I had 7~14 FPS

 

on the 3rd picture I checked burning targets on the ground and I still had 7~14FPS

 

I used track IR5, Hotas Warthog joystick & throttle.

 

My computer spec is :

I7-8700K (none overclock) , Geforce GTX 1080 8G VRAM, DDR4 32Gb RAM, Samsung SSD

FPS droped from 70 to 8 at night strike report .trk