If you're using Windows 10, open a command prompt by right clicking Start, click Run and type in 'cmd' without the quotes then Open.
Then type 'ping server-54-230-141-38.sfo5.r.cloudfront.net' again without the quotes. Should give you 3 results showing some time in ms which should be <100. If it times out completely, that's an issue.
this is what I'm getting