One of these rumors appear on the site benchmarking Gfxbench.
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We forced Gfxbench to run in full-screen mode for the most accurate result possible.
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Just to double check, we tortured the phone using Gfxbench GL, which is a gaming benchmark app
that measures the phone's FPS when running different games.
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But the offscreen Gfxbench result shows the iPhone Xs does
offer a performance boost over last year's model- and more performance per pound than any other smartphone on the market.