reio thank you,
It does not make much sense because 1.73.19228 didn't introduce any changes.
So far, we have tried dozens of open-source projects based on Symfony, and we can't reproduce the issue ...
- I can add internal diagnostics that would log anything taking longer than expected.
- Or we would really appreciate anyone sharing the project causing the issue - settings and the minimal test case.
There must be something different on affected machines
EDIT: we found the issue - it's caused by some syntactically incorrect .php files, usually a part of unit tests included in some composer packages.