Puzzle ITC - Performance Drop in Backlogs since OpenProject 17.2.2 – Incident details

We have observed a significant drop in performance in the Backlogs module after updating to OpenProject 17.2.2.
The following issues are particularly noticeable:

1. Slow loading times:

   • Initial loading of backlogs takes considerably longer than in previous versions.

   • Opening individual features/stories within the backlog is delayed (2–3 seconds per interaction).

2. Undesired GUI behavior:

   • Certain interactions (e.g., drag-and-drop sorting) exhibit unexpected delays or visual glitches, even though the backlog content itself remains unaffected.

Context:

• The issues emerged after the 17.2.0 update, which introduced the Primer Design System and Turbo/StimulusJS for dynamic updates in the Backlogs module.

• The problems are reproducible with large backlogs and persist in 17.2.2.

Workaround:

• Disabling "Show versions folded" in user settings mitigates the drag-and-drop issue, but is not a sustainable solution due to usability concerns.

We are currently investigating potential solutions and will keep you updated on our progress.