Eleventy 3.0.0 export performance regression #3473
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j9t
changed the title
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I'm currently migrating Eleventy Notes from v2.0.1 to v3. The template has just 45 files but the build time increases from ~0.35s to ~0.64s. That's still pretty fast of course, but I didn't expect that the build time increases with the update. Edit: I now tested Eleventy in a new project without any config on 10k markdown files and v3 is ~1s slower than v2. |
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We're processing approximately 5,000 files. On 11ty 2.0.1, it took 72.95 seconds (14.7ms per file), but on 11ty 3.0.0, it takes 186.98 seconds (37.5ms per file), nearly tripling the build time. I plan to start a fresh project to investigate further and determine what is impacting performance. |
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Could you also log Performance Metrics? That could help understand the specific part being slower. |
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Won't add the full log (~16,000 lines), but here is the ones that seem to use alot of resources. The debug took 110.76 seconds (22.2ms each) |
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Thanks! Looks I/O bound (Template Read and Write) |
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Attaching my own log. A bit faster on this run (55 seconds), but slower than pre-Eleventy 3.0.0. |
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Thanks. I spotted: Unrelated (see |
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I stripped everything from my project, leaving only the markdown files. I also created empty shortcodes to avoid refactoring them. Below is a comparison between 11ty 2.0.1 and 3.0.0 for generating files from markdown, both using the same stripped-down code with the debug variable.
The results below are from five builds. The first build needed to generate the output folder.
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Side note, I took this to investigate and noticed I don’t need (That’s not to distract from the issue though—Eleventy performance did degrade after the upgrade.) |
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Spent a little time on this one in PR #3493 Bench results: Worth nothing that there is extra overhead that came with ESM support and the ESM loader built into Node.js that is just a bit slower overall, unfortunately—but improvements are being made! |
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For other folks, it’d be very helpful to get a I will also accept these via email if you don’t want to attach them to the issue: |
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Hey @zachleat, Thanks for your time on this one! Your command didn't work on my side, but using this one works It has generated 2 files: |
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Hey @michael-proulx your profiles revealed the same slowdowns eliminated in #3493! Thank you for uploading! Looks like you’ll save about 1.8s on your build with those improvements 
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I also face a big increase of my build time with Eleventy 3 (but it's not the only change in my project, and issues with time limit on Netlify: https://mamot.fr/@nhoizey/113378722980419766 I ran the command to get the I guess I should use
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I have a strange issue where locally on my MacBook Pro (M1), it builds my blog in ~9s, but on my VPS, it starts fast, but then slows down to a halt the more pages it writes, until eventually it gets killed.
If I run |
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Server: Client: One thing sticks out in the server debug logs:
Why would passthrough copying take so long? |
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Operating system
macOS 14.6.1
Eleventy
3.0.0
Describe the bug
Just kicking this off as an observation, I’m consistently observing a significant performance regression after upgrading from Eleventy 2.0.1 to 3.0.0.
With no other changes, processing ~10,000 files resulting in ~1,500 output files took ~45 seconds before, and ~65 seconds now.
I can make access to the private repo available if of interest, but do also submit this to give other Eleventy users a chance to collect similar observations, as well as to comment if this is a known issue or perhaps being worked on.
Reproduction steps
(As described.)
Expected behavior
Given how important performance is, export time stays roughly the same or improves.
Reproduction URL
No response
Screenshots
No response
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