You're supposed to use TrackPopupMenu in a callback, like 
sub Tray_RightClick {
  $win->TrackPopupMenu($menu->{Tray}, Win32::GUI::GetCursorPos());
  return 1;
}

[download]
traymon.pl - Easily add a System Tray icon to an exisiting program

In reply to Re: TrackPopupMenu delay by Anonymous Monk
in thread TrackPopupMenu delay by p1ato

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