Thank you for your help! I’m inclined to believe it might be an OS specific difference given all of this - I updated to a set of recent nightly build packages (torch 1.5.0.dev20200301+cpu, torchvision 0.6.0.dev20200302+cpu) and while I am still seeing better throughput, it’s still not close (run on a Intel(R) Xeon(R) CPU E5-1650 v4 @ 3.50 GHz):
{'eager_mode': [1.3861324000000002,
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                1.3723590000000012,
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                1.4537896999999997,
                1.2923495999999997],
 'script_mode': [1.4593779999999938,
                 1.3242908,
                 1.3686729,
                 1.3443377999999981,
                 1.3476385000000022,
                 1.3000840999999994,
                 1.3655263999999931,
                 1.3246092999999917,
                 1.365785399999993,
                 1.3713202999999936],
 'trace_mode': [1.5728131000000012,
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                1.5698326999999992,
                1.544288299999998,
                1.5589613,
                1.5596863000000027,
                1.5536323000000039,
                1.568505100000003,
                1.6192179000000024,
                1.593777799999998]}