Hey there. I’m not familiar with Magento and don’t have an account with Polish or Rocket Loader, so, you know, fair warning: you seem to have a lot of HTTP request for JS & CSS (over 40) - I see these assets are minified, but is there any way you can combine these assets to cut back on the number if HTTP requests? Again, I’m not familiar with Magento, so I’m not sure if there are plugins available that will concatenate these assets for you, but it’s something I would look into if you’re looking to improve performance or page speed scores.
Martijn is also correct in that you have external assets being served from over 10 different domains. This also has an impact on your page speed score.