Slow connectivity with external WiFi

[AC Question]

A lot of the time when I'm out and about, I'll connect to a WiFi hotspot or WiFi where I work, and I'll try to access a page and it'll take forever to connect - if at all. I get frustrated and turn off WiFi, and boom - the page loads. But now, I'm burning my data minutes. Is there some kind of setting or security or something that may be slowing me down?