1) Blocks rapidly go on and off, especially when something they don’t like is on the news. Often sites will vanish for a few days. I’d imagine there’s some bureaucracy back there and all kinds of queuing systems. God knows.

2) It’s easy to confuse a block with overseas websites (and to some extent local websites) slowing to a crawl during from 5PM-11PM and often on weekends. In a lot of big cities it is particularly bad. It’s a matter of infrastructure, though. Not much backbone here.

3) Some service providers have their own filters in addition to the governments, filtering obscene, harmful-to-children type stuff based on keywords which is infuriating.