When configuring a job or a pipeline through JobDSL or Jenkinsfile the default value for maxConn isn't 1 as per documentation but 0 which causes remote triggers to time out twice - which gives a 60 seconds delay before the remote build is actually triggered.

When configuring the job in the GUI the default is 1.

Also JobDSL doesn't support setting maxConn so you need to use a configure block for that.

There's a PR to fix this issue: https://github.com/jenkinsci/parameterized-remote-trigger-plugin/pull/75