Slowdowns on documentation site generated by PHPDocumentor

[c-schmitz]

We create our documentation using phpDocumentor 3.4.3
The created documentation looks fine, however when browsing the documentation there are slow downs.

Go to https://api.limesurvey.org and click around using the latest Firefox version. Sometimes you have to wait several seconds before you can click on the next link. The complete browser hangs, it seems to be a JS issue

Expected behavior

Normal browsing

Actual behavior

After loading a page it still keeps the browser busy, unable to click on the next link.

Steps to reproduce the problem

1. Go to https://api.limesurvey.org
2. Click link for namespace ComfortUpdater
3. Try to click the 'Helpers' namespace right after that.
4. Try a few other pages , like https://api.limesurvey.org/namespaces/expressionansweroptions.html and then click directly on the class name link 'AnswerOptions'

Your environment

Normal nginx webserver,
phpDocumentor 3.4.3

Amother thing I noticed:

When I open https://api.limesurvey.org/classes/ExpressionAnswerOptions-AnswerOptionsFunctions.html I can see in the browser network tab that it tries to load non-existing txt files ( https://api.limesurvey.org/files/application/core/plugins/ExpressionAnswerOptions/AnswerOptionsFunctions.php.txt )