i was looking to upgrade from foundation 5 to 6. I just started a page from an old site. I stripped down a customized version of foundation 6 and mainly got the content up there. I haven't completed the layout, but just wanted to compare the structure for page load time. I compared http://yogawestchesterny.com/ in foundation 5 with http://integrated-peace-arts.org/aikido/ prototype in foundation 6. On the pingdom tool the foundation 6 website was 50kb larger. Then for the google recommended test (https://developers.google.com/speed/pagespeed/insights/?hl=en&utm_source=wmx&utm_campaign=wmx_otherlinks&url=http%3A%2F%2Fyogawestchesterny.com%2F&tab=mobile) it showed more problems in the foundation 6.
I thought foundation 6 was supposed to be lighter and faster. Maybe these tools are not the best, but from what I can see, foundation 6 is failing on that front. Am I wrong?