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Test Results

This document summarizes recent CLI runs against test-imgs/ using different presets, formats, and bulk modes.

Dataset

  • Source: ./test-imgs/test1 and ./test-imgs/test2 (PNG images)
  • Platform: macOS
  • Node: >= 18

Runs

1) Bulk on test1 with --preset balanced

  • Command: optimg ./test-imgs/test1 --bulk --preset balanced --yes
  • Files processed: 7
  • Overall reduction: 39.2% (21.96MB → 13.35MB)
  • Average size reduction: 39.4%
  • Total saved: 8.61MB
  • Avg time/file: 1440ms

2) Bulk on test1 with --preset performant

  • Command: optimg ./test-imgs/test1 --bulk --preset performant --yes
  • Files processed: 7
  • Overall reduction: 39.2% (21.96MB → 13.35MB)
  • Average size reduction: 39.4%
  • Total saved: 8.61MB
  • Avg time/file: 1459ms

Note: For this dataset, balanced and performant produced identical aggregate reductions.

2b) Bulk on test1 with --preset default and --preset quality

  • Commands:
    • node bin/cli.js ./test-imgs/test1 --bulk --preset default --yes
    • node bin/cli.js ./test-imgs/test1 --bulk --preset quality --yes
  • Files processed: 7 (each run)
  • Overall reduction: 39.2% (21.96MB → 13.35MB)
  • Average size reduction: 39.4%
  • Total saved: 8.61MB
  • Observation: Identical results across default, balanced, quality, and performant due to lossless WebP encoding.

3) Bulk on test1 with --format avif --quality 80

  • Command: optimg ./test-imgs/test1 --bulk --format avif --quality 80 --yes
  • Files processed: 7
  • Overall reduction: 2.2% (21.96MB → 21.49MB)
  • Average size reduction: 0.2%
  • Total saved: 487.32KB
  • Avg time/file: 5109ms
  • Observations:
    • Some PNGs grew when converted to AVIF (e.g., geustral_init-5.rop_image1.0034.png and Screenshot 2025-11-25 at 17.52.33.png).
    • AVIF may underperform on certain screenshot-style or synthetic textures at quality 80.

4) Bulk-Inplace on test2 with --preset balanced

  • Command: optimg ./test-imgs/test2 --bulk-inplace --preset balanced --yes
  • Files processed: 21
  • Overall reduction: 39.2% (65.88MB → 40.05MB)
  • Average size reduction: 39.4%
  • Total saved: 25.84MB
  • Avg time/file: 1560ms
  • Behavior: Outputs optimized files next to originals (preserves directory structure).

Key Takeaways

  • WebP (balanced and performant) delivered consistent ~39% reductions on this dataset.
  • All presets currently run with lossless: true for WebP/AVIF; quality values have limited impact under lossless.
  • AVIF at quality 80 had mixed results and increased sizes for some files; use selectively and validate on your own assets.
  • --bulk-inplace is useful when you want optimized files adjacent to sources without creating new folders.

Reproduce Locally

Run locally:

optimg ./test-imgs/test1 --bulk --preset balanced --yes
optimg ./test-imgs/test1 --bulk --preset performant --yes
optimg ./test-imgs/test1 --bulk --format avif --quality 80 --yes
optimg ./test-imgs/test2 --bulk-inplace --preset balanced --yes