Job.getBuildHealthReports can be expensive, especially with Maven projects (see
JENKINS-19392). Putting jobs into folders does not help, because Folder.getBuildHealthReports recursively traverses them, and the default WorstChildHealthMetric checks the result of each leaf. It should not be called synchronously during page rendering. Rather, WeatherColumn/column.jelly should use an AJAX callback of some kind, effective while the page is fronted. So you would get a quick page load, with some icons filling in progressively. Still puts load on the server but potentially much less.