The Gantt chart could become far more useful to see how a dag is performing. We should make it a first class citizen by integrating it with the tree view.

The gantt rows can be lined up with the tree view to keep context.
It would be easy to explore different runs by selecting separate columns in the tree view.

Without a dag run selected we can have a summary across many dag runs. Even including a box and whisker plot to show the median run times and min/max.

If you have selected an active run, the gantt view should also auto-refresh.