UPDATE: WP Engine has reported that the issue is now resolved. 

WP Engine has reported an issue with network connectivity to one of their Australian datacenters. As a result, some clients who have their website hosted via WP Engine (our Google cloud hosting provider) may experience slow loading or page time-outs when loading their site. WP Engine is actively investigating this issue. We apologise for the inconvenience; please visit wpenginestatus.com for updates.