empty ajax request takes more than 1.8 sec

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Hi!

I have a locale (VirtualBox Ubuntu with php 5.5.9) 5.7.3.1 site and made a package to test code changes from 5.6.
Now I routed a controller / view pair for my ajax request and it's working fine... well exept for the speed...

Like the site itself the ajax request is very slow responding... in the page controller the view takes only 0.07 seconds - the page to display this information takes nearly 2 seconds.
Now I put a die(); in fornt of the view methos in the ajax controller and it takes 1.8 seconds to finish the request.

Activating Site Cache didn't change this.

How can I speed up the responding time of the Ajax Request and the time of the page from finishing the view method to displaying the (nearly empty) page?