pressflow-7.41

https://www.drupal.org/SA-CORE-2015-004

pressflow-7.40

https://www.drupal.org/drupal-7.40-release-notes

There's some pretty awesome performance improvements in this particular release, specifically:

• https://www.drupal.org/node/2263365
• https://www.drupal.org/node/2146643

pressflow-7.39

https://www.drupal.org/SA-CORE-2015-003

pressflow-7.38

https://www.drupal.org/SA-CORE-2015-002

pressflow-7.37

https://www.drupal.org/drupal-7.37-release-notes

pressflow-7.36

https://www.drupal.org/drupal-7.36-release-notes

pressflow-7.35

https://www.drupal.org/SA-CORE-2015-001