[slyall]

The numbers there are bogus. In reality your client isn't setup to ping remote sites every 15 minutes. Instead it'll learn and only ping once per day or so (or if you force a refresh).

Whats more if you use a SaaS based service then it'll only refresh each site once for the dozens to thousands of customers who subscribe.

[akurilov]

It's more about the polling tradeoff

Refresh frequently = waste resources

Refresh rarely = miss important message / too late