Reduce image resolution

[cmaureir]

High resolution images are slowing down the cloning, hopefully with this we can manage to get a better
experience.

[europython-society]

Preview available

Key	Value
url	https://reduce-image-resolution.ep-preview.click
last update	2026-01-20T10:25:18.009Z

[artcz]

LGTM!

[hugovk]

We can squeeze more out with https://github.com/oxipng/oxipng, I can open a PR if you like.

❯ oxipng -o max --strip all --recursive .
Processing: ./public/social-card.png
Processing: ./public/social/bg4.png
Processing: ./public/social/bg.png
Processing: ./public/EuroPython2025_logo_small.png
Processing: ./public/draft2.png
Processing: ./public/media/sponsors/social-pycon-fr.png
Processing: ./public/android-chrome-384x384.png
Processing: ./public/eps-logo-white.png
Processing: ./public/android-chrome-512x512.png
Processing: ./public/media/sponsors/social-pycon-it.png
5149 bytes (36.20% smaller): ./public/EuroPython2025_logo_small.png
Processing: ./public/EuroPython2025_logo.png
6117 bytes (20.72% smaller): ./public/EuroPython2025_logo.png
Processing: ./public/media/sponsors/social-dsf.png
31736 bytes (22.97% smaller): ./public/android-chrome-384x384.png
Processing: ./public/maskable_icon.png
8171 bytes (42.92% smaller): ./public/draft2.png
Processing: ./public/eps-logo.png
45251 bytes (21.38% smaller): ./public/android-chrome-512x512.png
Processing: ./public/logo.png
15151 bytes (24.54% smaller): ./public/logo.png
Processing: ./public/hr.png
252 bytes (39.86% smaller): ./public/hr.png
Processing: ./public/media/sponsors/social-sentry.png
35196 bytes (33.45% smaller): ./public/maskable_icon.png
Processing: ./public/android-chrome-192x192.png
44905 bytes (29.35% smaller): ./public/eps-logo-white.png
Processing: ./public/android-chrome-36x36.png
1434 bytes (49.56% smaller): ./public/android-chrome-36x36.png
Processing: ./public/android-chrome-96x96.png
5891 bytes (27.15% smaller): ./public/android-chrome-96x96.png
Processing: ./public/overview/placeholder.png
13860 bytes (24.73% smaller): ./public/android-chrome-192x192.png
Processing: ./public/images/placeholder.png
./public/images/placeholder.png: Could not optimize further, no change written
Processing: ./public/social/circle.png
./public/social/circle.png: Invalid header detected; Not a PNG file
Processing: ./public/social/bg5.png
60781 bytes (44.83% smaller): ./public/social/bg.png
Processing: ./public/android-chrome-256x256.png
11456 bytes (19.51% smaller): ./public/overview/placeholder.png
Processing: ./public/android-chrome-72x72.png
3886 bytes (32.03% smaller): ./public/android-chrome-72x72.png
Processing: ./public/android-chrome-48x48.png
19614 bytes (23.32% smaller): ./public/android-chrome-256x256.png
Processing: ./public/images/sprints.png
2187 bytes (40.68% smaller): ./public/android-chrome-48x48.png
Processing: ./public/draft.png
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Processing: ./public/media/sponsors/social-microsoft.png
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Processing: ./public/media/sponsors/social-cultrepo.png
344515 bytes (14.09% smaller): ./public/media/sponsors/social-pycon-fr.png
Processing: ./public/media/sponsors/social-ataccama.png
341000 bytes (13.70% smaller): ./public/media/sponsors/social-dsf.png
Processing: ./public/media/sponsors/social-pyladiescon.png
Processing: ./public/media/sponsors/social-numberly.png
333787 bytes (22.49% smaller): ./public/social/bg5.png
Processing: ./public/media/sponsors/social-pycon-at.png
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Processing: ./public/media/sponsors/social-lwn-net.png
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37581 bytes (49.92% smaller): ./public/social/color.png
Processing: ./public/media/sponsors/social-prusa.png
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Processing: ./public/social/bg3.png
340771 bytes (13.94% smaller): ./public/media/sponsors/social-microsoft.png
Processing: ./public/media/sponsors/social-pyvec.png
341055 bytes (14.04% smaller): ./public/media/sponsors/social-ataccama.png
Processing: ./public/media/sponsors/social-google-cloud.png
Processing: ./public/media/sponsors/social-djangocon.png
341649 bytes (13.62% smaller): ./public/media/sponsors/social-cultrepo.png
Processing: ./public/media/sponsors/social-qt.png
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Processing: ./public/media/sponsors/social-pretalx.png
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Processing: ./public/media/sponsors/social-pycon-gr.png
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Processing: ./public/media/sponsors/social-startup.png
348626 bytes (13.41% smaller): ./public/media/sponsors/social-prusa.png
Processing: ./public/media/sponsors/social-anaconda.png
Processing: ./src/content/pages/images/remote.png
340006 bytes (13.98% smaller): ./public/media/sponsors/social-pyvec.png
Processing: ./public/media/sponsors/social-pretix.png
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Processing: ./public/media/sponsors/social-pyvo.png
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Processing: ./public/social/bg2.png
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Processing: ./public/media/sponsors/social-apify.png
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Processing: ./public/media/sponsors/social-junior-guru.png
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Processing: ./public/media/sponsors/social-pydantic.png
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Processing: ./public/media/sponsors/social-jetbrains.png
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339076 bytes (13.79% smaller): ./public/media/sponsors/social-pyladiescon.png
Processing: ./public/media/sponsors/social-rossum.png
Processing: ./public/media/sponsors/social-picnic.png
350256 bytes (13.26% smaller): ./public/media/sponsors/social-anaconda.png
1250852 bytes (15.99% smaller): ./src/content/pages/images/remote.png
Processing: ./src/content/pages/images/accessibility-references.png
Processing: ./public/media/sponsors/social-gel.png
Processing: ./src/content/sponsors/pydatatrojmiasto/pydatatrojmiasto.png
340188 bytes (13.95% smaller): ./public/media/sponsors/social-pretix.png
Processing: ./public/media/sponsors/social-pycon-fi.png
Processing: ./src/content/pages/images/accessibility-first-floor-map.png
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Processing: ./public/media/sponsors/social-bloomberg.png
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Processing: ./public/media/sponsors/social-pyladies.png
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Processing: ./src/content/pages/images/sprints-collage23.png
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Processing: ./src/content/pages/images/discord.png
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Processing: ./public/media/sponsors/social-snowflake.png
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Processing: ./src/content/pages/images/aigametournament.png
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Processing: ./src/content/pages/images/voting.png
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Processing: ./src/content/pages/images/accessibility-parking-map.png
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Processing: ./public/social-card-old.png
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Processing: ./public/android-chrome-144x144.png
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Processing: ./public/media/sponsors/social-travelperk.png
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[egeakman]

We can squeeze more out with https://github.com/oxipng/oxipng, I can open a PR if you like.

That would be great @hugovk! Thanks 😊

We should also probably do something similar for added/modified images as a GHA on PRs. But that's totally up to you to implement that 🙂 running oxipng on the repo manually would already be very useful

[hugovk]

We can squeeze more out with oxipng/oxipng, I can open a PR if you like.

That would be great @hugovk! Thanks 😊

Coming up!

We should also probably do something similar for added/modified images as a GHA on PRs. But that's totally up to you to implement that 🙂 running oxipng on the repo manually would already be very useful

Yep, here's two methods.

Enable https://imgbot.net/ for the repo and it'll open PRs with optimised images.

• Runs after merging original images.

Add https://github.com/oxipng/oxipng to .pre-commit-config.yaml (looks like https://pre-commit.ci/ is already enabled for the repo).

• Will update PRs before merge.
• Will also catch other pre-commit autofixes like Prettier.
• If you use pre-commit (or prek) locally, it makes pre-commit run --all-files slower by ~1m48s. But normal git commit will only check modified files.

Which do you prefer?

[egeakman]

Continuing here: #1518