It opens instantly here.
Make sure the dopus.exe process is not running as administrator, as that will block things from the shell from being able to communicate with it. See here.
If it was not running as admin, could your antivirus be involved? Or any other shell extensions? Using ShellExView or Autoruns to check what else is installed, or Process Monitor to see which actions happen during the delay, may shine a light on what is happening.