spitfire module instant action squadron scrambled 1940 (normandy map) unplayable fps after merging with 30+ german planes.

[nir]

In the spitfire module instant action mission squadron scrambled 1940 in normandy map, attacking 30+ bombers over london,
the fps crawls down to unplayable mess once merging with the german bombers.
This seems a CPU bottleneck problem, not a GPU problem. 

GPU 5080 (latest drivers)
The CPU is 7800X3d. 
32GB memory 6000MT/s
DCS World MT (latest)
Windows 11

Is this a known problem ?
Is there a solution ?

[razo+r]

Is the wake turbulence option turned on? If yes, have you already tried it with this option disabled?