Responsive Lightbox queues up jQuery in header

I am not sure whether WordPress core default-loads jQuery in header or footer, but on site with Thesis theme:

If no lightbox script, no blocking jquery.
https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fwww.metroparkhotelcebu.com%2Fhotel-policies

With lightbox script, there is blocking jquery.
https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fwww.metroparkhotelcebu.com%2Feconomy-room%2F885

If you say that jquery has to load first for responsive lightbox to work, I won’t argue and will continue to use it (as is) since (for now) I think lightbox is important enough to justify the speed penalties.

But if responsive lightbox can work with jquery defered or asynchronously loaded, please let me know because there are cache plugins that will force js to be deferred. I also know that it can be done through functions.php