golang/go

image/jpeg: Decode is slow

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#24,499 opened on Mar 23, 2018

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Description

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?

Contributor guide

Research direction
Analyze the current Go JPEG decoder source code, profile using benchmarks, identify bottlenecks (e.g., Huffman decoding, IDCT), and research optimizations like SIMD (AVX2/SSE) or look up tables. Compare implementation with libjpeg for potential algorithmic improvements.
Tech stack
go
Domain
performance
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Goimage/jpeg
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15