Wonderful theme!

I've upgraded to the latest theme version, but pages with the portfolio turned on ( /arts) (/clients) freezes Firefox completely.

This happened before the update to WordPress 4.0 so I hoped that updating would fix it but it has not.

I can't even turn on my inspector to see what the console is saying, unfortunately the browser freezes on these two pages. Others are not affected. I've turned off all plugins to test, seems to be persistant no matter what.

Many thanks in advance!