Whatever feature / functionality that site is providing, when it's slow, the forum pages and the wiki pages are slow. Basically they stall until whatever requests made to that URL are complete.
It's not a good look anyway. Anything called "analytics.com" doesn't give me warm fuzzies - I doubt it's doing anything for my benefit.
But in any case, I suggest you either remove the dependency on that site/URL or reimplement how the forum pages and wiki pages use it so they don't stall completely until it returns.
Thanks,
Donnie