DMONLY-performance.md

-![runtime](/uploads/5913bb22fdbffae0c484794a8adf9a48/runtime.png)
+Corrected version of run time plot, also with time on the x axis.
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+
+![runtime](/uploads/a6d1c9f950a14518c5f00b2d3c72e4d1/runtime.png)
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