Browsers have no reliable event saying "JS has finished executing", because there might be a timer constantly executing functions or callbacks triggered by returning AJAX requests ... and so on.
Note also that JS can run in parallel.
So you have to tell Mechanize to wait for an DOM-element to appear which represent the state you consider "finished".
When working with WWW::Mechanize::Firefox many years ago I used this Wait-until-an-element-appears approach.
You have to see how this best translates to PhantomJS and your use case.
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