When I upgraded setuptools to 5.4.x, Trac became completely unresponsive
(loading a simple page takes 30 seconds instead of less than 1).
(On Windows, Python 2.6 or 2.7, Trac trunk tracd. The problem only
manifested itself when Trac was installed as an egg, not in "setup.py
develop" mode.)
Downgrading setuptools (to 5.3 or below) fixed the problem.
[1] points to [2] and mentionsthe PKG_RESOURCES_CACHE_ZIP_MANIFESTS
environment variable. Setting that environment variable with 5.4 also
enables reasonable performance. Although it sounds like this enables a
new experimental feature. So why is it required to get back performance
similar to 5.3?
Am I missing something? (Should we report a bug? Warn users against this
version?)
[1] https://pypi.python.org/pypi/setuptools#id3
[2] https://bitbucket.org/pypa/setuptools/issue/154
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