In Jenkins versions newer than 1.593 we see issues with jobs that have a long job configuration when we want to edit/check the job configuration in the GUI. The loading page remains gray and in Firefox we get script errors. IE and Chrome show very long loading time. Sometimes 10+ minutes. The config.xml of such "long" job configurations are over 2000 lines long. Short job configs in comparison have less than 300 lines.
The message regarding scipt errors repeats or Firefox (or IE) process gets stuck.
1.593 seems to be the last version which does not show the issue. All newer releases including the LTS and latest and greatest show the same behaviour.