I have not really noticed anything on my iPad mini 2 with this site.
Nor have I noticed any slowness on desktop or iPad.
But.... I have a 1Gbps pipe from Google Fiber (Webpass). It's an RF link to a newer nearby highrise that has fiber - but even in the heavy rains we are having right now, not shabby...
Big bandwidth is big bandwidth. I wouldn't expect it to be slow!
Since people were complaining, I took a peek with Chrome dev tools. It's a bloated mess. But so it e.g. the AT&T website, and many sites that you would think would do a better job. (I sometimes answer questions on a tech board where AT&T's offshore developers come for Javascript help when they are asked to add yet another script to that mess...)