I improved the GPU readback so the CPU no longer has to wait for the GPU every frame (Gemini noticed that this happend and with its help I fixxed it). Before the resul buffer was copied and read immediately which could cause the CPU to block while the GPU was still processing shader.

This is difficult because getting the CPU and GPU sync right is tough. As the CPU should only read a buffer when the GPU finished writing on it.
I used ID3D11Query events for it:

if (r.pending &&
context->GetData(r.query.Get(), nullptr, 0, 0) == S_OK)
{
context->Map(r.buffer.Get(), 0, D3D11_MAP_READ, 0, &m);
serial.send((const UINT*)m.pData);
context->Unmap(r.buffer.Get(), 0);
r.pending = false;
}