diff --git a/idd/LGIdd/CD3D12Device.cpp b/idd/LGIdd/CD3D12Device.cpp
index 6ea84d91..430b7080 100644
--- a/idd/LGIdd/CD3D12Device.cpp
+++ b/idd/LGIdd/CD3D12Device.cpp
@@ -172,14 +172,15 @@ bool CD3D12Device::HeapTest()
 
 CD3D12CommandQueue * CD3D12Device::GetCopyQueue()
 {
-  for(int c = 0; c < 100; ++c)
+  // try for up to a maximum of 100ms to find a free copy queue
+  for (int c = 0; c < 100; ++c)
   {
-    for (int i = 0; i < ARRAYSIZE(m_copyQueue); ++i)
-    {
-      auto& queue = m_copyQueue[i];
-      if (!queue.IsReady())
-        continue;
+    auto& queue = m_copyQueue[m_copyQueueIndex++];
+    if (m_copyQueueIndex == ARRAYSIZE(m_copyQueue))
+      m_copyQueueIndex = 0;
 
+    if (queue.IsReady())
+    {
       queue.Reset();
       return &queue;
     }
diff --git a/idd/LGIdd/CD3D12Device.h b/idd/LGIdd/CD3D12Device.h
index 708320ff..be43552a 100644
--- a/idd/LGIdd/CD3D12Device.h
+++ b/idd/LGIdd/CD3D12Device.h
@@ -29,7 +29,8 @@ struct CD3D12Device
     ComPtr<ID3D12Device3> m_device;
     ComPtr<ID3D12Heap   > m_ivshmemHeap;
 
-    CD3D12CommandQueue m_copyQueue[2];
+    CD3D12CommandQueue m_copyQueue[4];
+    unsigned           m_copyQueueIndex = 0;
     CD3D12CommandQueue m_computeQueue;
 
     bool HeapTest();