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18 changes: 14 additions & 4 deletions docs/src/whatsnew/latest.rst
Original file line number Diff line number Diff line change
Expand Up @@ -65,10 +65,18 @@ This document explains the changes made to Iris for this release
#. N/A


🚀 Performance Enhancements
===========================
🚀 Performance
==============

#. N/A
#. `@trexfeathers`_ investigated a significant performance regression in NetCDF
loading and saving, caused by ``libnetcdf`` version ``4.9.3``.
The regression is equal to several milliseconds per chunk
of parallel operation; so a dataset containing ~100 chunks could be around
0.5 seconds slower to load or save. This regression will NOT be fixed within
Iris - doing so would introduce unacceptable complexity and potential
concurrency problems. The regession has been reported to the NetCDF team; it
is hoped that a future ``libnetcdf`` release will recover the original
performance. See `netcdf-c#3183`_ for more details. (:pull:`6747`)


🔥 Deprecations
Expand Down Expand Up @@ -114,4 +122,6 @@ This document explains the changes made to Iris for this release


.. comment
Whatsnew resources in alphabetical order:
Whatsnew resources in alphabetical order:

.. _netcdf-c#3183: https://github.com/Unidata/netcdf-c/issues/3183
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