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image/jpeg: Decode is slow #24499

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@deepch

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@deepch

Mac OS Sierra
go version go1.10 darwin/amd64
CPU 3,5 GHz Intel Core i7

I noticed that the use of decode jpeg is very slow.

decode image jpeg 1920x1080

I test github.com/pixiv/go-libjpeg/jpeg and native jpeg

go 1.10 jpeg.decode ≈ 30 ms cpu ≈ 15 %
libjpeg jpeg.decode ≈ 7 ms cpu ≈ 4 %

will it ever go as fast as other libraries?
is it possible that in the next versions the native implementation will become faster?

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