New description

As per luke.pearson@mongodb.com this regression is a result of a correctness change so it could not be rolled back. However, it is interesting that this change resulted in such a massive performance drop, so it might provide useful context for further performance improvements.

Since the change fixed version cursors, this should be handled by the Foundations team.

Perf regression old ticket body

A recent change affecting the wiredtiger evergreen project has potentially caused performance changes to one or more automated performance tests.

• Commit info - c992327, 2026-01-27
• Failing Evergreen Task

This Perf BF may contain both regressions and improvements with the emphasis being drawn to regressions. On the Perf BF page, you may filter out regressions by selecting the corresponding Change Type (far left) column in the table.

• All performance metrics, tasks and tests that have been altered as a result of this change can be found in the Full list of change points for this BF

When closing this ticket, please populate the 'Fix revision' field if appropriate.