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Script size limits are too strict for Python apps #156
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Thanks for the suggestion (fyi for other readers, we've been discussing this in EuroPython offline).
The current size limits of 3MB (free plan) or 10MB (paid plan) for the gzipped size are too tight for Python apps because many popular Python libraries contain large binaries.
We are planning to change this to 64 MB, uncompressed size for every plan. I thought it was already applied, but it seems like it isn't yet.
such prepackaged/common libraries were excluded from the size calculation,
Unfortunately, this is unlikely to happen. Instead, I am thinking to implement some kind of Python bundler, similar to the JS bundlers that compresses Python libraries and do the tree-shaking.
Reacted by Yuichiro Tachibana (Tsuchiya)- added a commit that references this issue
on Jul 25, 2026 Thank you,
- I will be waiting for the size limit change to be rolled out.
- Python bundler sounds cool.
- but in my case the dominant large files were compiled binaries in native packages such as numpy and pandas.
Yeah, unfortunately if you are running a cpu heavy workload with large packages, it doesn't perfectly fit with the design of the Cloudflare workers, and probably you need to combine other products such as Cloudflare containers.
Reacted by Yuichiro Tachibana (Tsuchiya)- added a commit that references this issue
on Aug 2, 2026 We are planning to change this to 64 MB, uncompressed size for every plan. I thought it was already applied, but it seems like it isn't yet.
FYI, this is released (cloudflare/cloudflare-docs#33241)
Good to know that. Thank you.
The current size limits of 3MB (free plan) or 10MB (paid plan) for the gzipped size are too tight for Python apps because many popular Python libraries contain large binaries.
For example, when I tried to deploy an app using the following libraries, it easily hit the limit (sizes are the sums of the gzipped files of each vendored package):
pandas2.3.3: 4.22MBnumpy2.2.5: 2.90MBPillow11.3.0 (PIL): 0.99MBaltair6.0.0: 0.74MBlibcrypto.so: 0.62MBAll of them were vendored from the Pyodide v0.29.3 distribution (Python 3.13), synced with
workers-py1.15.0 and deployed withwrangler4.110.0.I believe these libraries are very commonly used in the Python ecosystem and cannot be omitted when developing meaningful applications in certain domains.
I believe this is one of the biggest differences from the JavaScript ecosystem.
It would be great if
Thank you.