impossible to play Blight ravaged : FPS drop to 2 (two)

bug 4,189,485,322

I tried 2 blight ravaged maps, tier 14.

The first time game almost freeze
=> i pressed esc to not die, F9 to see the 400ms latency, 2FPS
After a while things came back to normal , but the timer has continued, so the encouter had ended during Pause ! (which explain why the fps came back to normal).


Second time i lower my resolution, effects,light sources ...
Same problems

I have no problems during other maps, even with all my minions (18 + 30 whit vaal skeletons), even with higher screen resolutions.

my config :
Linux + steam + Vulkan
Ryzen 5600X + 64G RAM
RX600XT 16GB video ram (it is newer completely used, the game seems to use less than 6GB)
default 60fps , target 30fps

I'll give another try with D3D12 instead of vulkan