i am having the same issues on my NBN connection on many random sites, need to refresh 3 or 4 times before it finally loads.
i set my DNS to 8.8.8.8 and 8.8.4.4 and i get no issues.
set back to Telstra DNS and boom timeouts.
This is what my DNS is normally.
Primary DNS
61.9.133.193
Secondary DNS
61.9.134.49