The mentioned warning message provides additional information to help identify when calls to LockBufferForWrite are performing slowly on D3D11.

In the case of the provided reproduction project where LockBufferForWrite is called multiple times per frame, the warning message can be addressed by lifting the call to BeginWrite outside of the loop.

Initial code:
{code:c#}
for (int i = 0; i < 10; i++)
{
Unity.Collections.NativeArray<ushort> writer = testBuffer.BeginWrite<ushort>(chunkSize * i, chunkSize);
writer.CopyFrom(chunkData);
testBuffer.EndWrite<ushort>(chunkSize);
}
{code}
Warning addressed:
{code:c#}
Unity.Collections.NativeArray<ushort> writer = testBuffer.BeginWrite<ushort>(0, chunkSize * 10);
for (int i = 0; i < 10; i++)
{
NativeArray<ushort>.Copy(chunkData, 0, writer, chunkSize * i, chunkSize);
}
testBuffer.EndWrite<ushort>(chunkSize * 10);
{code}