Reduce memory usage when scheduling pipelines on big clusters.
JENKINS-48348
Improve UI performance with long list of running builds by caching the estimated duration.
JENKINS-48350
Bug fix
Update Stapler from 1.253 to 1.254 to make the form that shows up when a URL requiring POST is accessed using a different HTTP verb work with CSRF protection enabled.
JENKINS-34254, Stapler changelog
Do not downgrade detached plugins when upgrading Jenkins while its previous version was not properly recorded.
JENKINS-48899
The setup wizard is now resumed upon restart if it hasn't been completed yet, instead of showing the regular login screen. (regression in 2.81)
JENKINS-47439