When execute Jenkins manually or by scheduler, the execution time varies extremely different. This is based on the code below:

Code:

echo "BEFORE items.findAll."

    def matchedJobs = Jenkins.instance.items.findAll { it.name.toUpperCase().startsWith(projectName.toUpperCase()) }

echo "AFTER items.findAll."

Console:

Start the build manual:

17:25:41  BEFORE items.findAll.

17:27:00  AFTER items.findAll.

Build started by scheduler:

17:32:18  BEFORE items.findAll.

17:32:18  AFTER items.findAll.