Does anyone else have loading time issues in Safari?

[DashSatan]

I'm on a 2015 MBPr "15, latest Yosemite update. Anytime I close my laptop or go to my desktop screen (I always keep safari in a full page) then go back later it always either takes forever to refresh Facebook, or just says "Safari can't connect to the internet". But here's the catch, it's ONLY with Facebook. I'll have other tabs open at the same time and they'll refresh if I hit Command + R. Anyone else have this issue?

 

[lysingur]

It's not only Facebook for me. Wikipedia loads slowly from time to time. It'll simply get stuck half-way and unless one forces Safari to reload, it'll stay that way.