Originally Posted by hisham Hostgators good and fast, never had any downtime in the year i was with them but if your site gets too much traffic you'll be suspended, but it's expected from shared hosting.

The thing is HostGator has a resource usage limit. Once it's reached you will be affecting the whole server and therefore affecting other customers. Once that happens, depending on the situation they will give you a hand on how to lower the resource usage or ask you to upgrade to a dedicated server.