This is strange really, that you have only 5 fps here, there is nothing that tough here to render. Even if there is 26192*2=1976 drawcalls (including lighting and transparency, but i don’t see some) that’s not that huge amount.
Can you share screenshot of profiler? In viewport settings there is a stats, there will be D3D11RHI or somewhat like that, I don’t actually remember.
Or print in console “stat d3d11rhi” for rendering statistics or “stat slow” for rendering timing.
Maybe there is CPU “giving up”?
I see you still have shadows, shadows can be disabled in light settings in level.
And what graphics card you have? I once had around 9000-10000 drawcalls (that’s how much I launched bullets into the air), but fps dropped from 60 to only 20, not that bad for such numbers. Bullets weren’t transparent, these was debug lines, poor PCI bus suffered a lot from updating 8192 bullets, so GPU itself felt fine.