I tried to optimize my blog http://www.macmaniacs.at in terms of pagespeed today. That for I deactivated my lightbox plusin "simple lightbox" and tried to reactivate it later on. Although it shows up as working perfectly fine, not one of all the pics on my website use the plugin anymore. I tried also a different lightbox plugin "responsive lightbox" but apparently it does not get used by wordpress either.
What I also did in terms of speeding up the site was to activate some of the standard settings in "WP super cache". I also added some blocks to my HTACCESS file for compressing code and also for optimizing browsercache.
Everything on the site works perfectly fine for me except the lightbox plugins which are cucial to me as I'm working with many galeries :-(
I'm absolutely no pro and I got no pro I could ask so hopefully you got some tips what I could do to have the lightbox up and running again.