I guess aomenc was used with 2-pass encoding for this test since "--passes=2" was set.
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..but they are terribly slow. I do not know how to speed up these encoders.
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In xvcenc you can try -speed-mode 2 or even the experimental -speed-mode 3 to increase encoding speed, but it will also result in reduced compression performance. Increasing number of -threads should also speed up encoding, at least if you are encoding a "long enough" sequence.