https://jenkins.io/doc/pipeline/steps/workflow-basic-steps/#wrap-general-build-wrapper

is a whopping 7.3MB of html, which slows down ordinary browsers considerably.

Seems that something went wrong when generating this:

There seem to be several issues:

1. There is one line that is 1.9MB alone, look for

${:encoding=>"UTF-8", :interpolate=>false, :scss=>{:line_numbers=>true, :style=>"expanded"}, :sass=>{:line_numbers=>true, :style=>"expanded"}, :content_syntax=>{"coffee"=>"coffeescript"
...

seems that someone is prinln-debugging there and printing out a large map/object.

2. There are 27 steps documented. The documentation between <h3...<code>step</code> and <h3...<code>timeout</code> (which are next to each other), take up 139512 lines, of a total of 139512 (98 percent). If that one step should take up 98% of 7.3 MB, it should probably be on its own page.