analyze result under timeline tab for gtmetrix.com
webpagtext.org always produce slowest result for me, here are yours
http://www.webpagetest.org/result/150410_AQ_GJS/
analyze what resources are taking most of time here
http://www.webpagetest.org/result/150410_AQ_GJS/1/details/
Do you have a lot of plugins on the site?
I found that after adding 10-15 my site started to take a little longer to load
Try enabling gzip:
http://checkgzipcompression.com/?url=http%3A%2F%2Fprojects.webjuice.eu
http://softstribe.com/wordpress/enable-gzip-compression-in-wordpress
Check the results that laliz links to as there are 2 x 404 errors from .png images
Re: the advice from Jordan, you can use the p3profiler plugin to asses the impact of plugins on your site load.
You have a 2-4 second wait for your server to respond. Check with your host, or consider adding a CDN.
Do these things, and you’ll see a big difference:
Install a caching plugin like WP Supercache or W3 Total Cache, and set them to cache pages and minify your code.
Install BJ Lazy Load pluing to lazyload your images.
Install WP Smush.it plugin to smush your images. Go back and use the bulk smusher on all your current uploaded media after you install it.
Use JetPack’s Photon module to serve your images from a CDN.
Use Cloudflare’s free CDN service.
Use the WP-Optimize plugin to keep your databases and tables clean.
Use Gzip Ninja Speed Compression plugin to Gzip your site.
Use GoDaddy’s P3 plugin performance profiler to pinpoint plugins that are slowing you down and replace/remove them.
Use Compressor.io’s app to compress photos before loading them.
