From OCE have been terrible for months. OCE and West Coast instances have been fine, but as soon as I get put in an East Coast host, it spikes to near unplayable lag.
Hi there. There is one server in mountain time (Las Vegas) and one in the Midwest (Chicago). Neither of the servers is on a coast 
It makes sense that your connection is much worse to Chicago, because those servers are another 1747 miles away (2811 kilometers).
I recommend looking for groups on Oceanic realms when possible, or at the very least, Las Vegas.
Easier said than done when it comes to queued content.
Am still awaiting Telstra to contact me back as they have apparently escalated the issue to specialists, but they have been made aware it is affecting numerous Australian players.
Not sure if you have checked the connections via WinMTR but I and some others have, and we noticed that weirdly enough the Chicago server which would usually have a worse connection due to distance, has been giving results that the Las Vegas server normally would.
Before this issue all started I would get ~250 ms on the LV server and 300+ on the Chicago server, but since the issue started, the LV server gives me 385+ and the Chicago server gives 200-250.
Super weird and also super annoying.
Only thing I can suggest is perhaps also contacting your ISP (I assume Telstra?) and informing them of the issue so they have more records about it.
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Have also had this problem for the last week or so, normally 180 Ping to LA and 250 to Chicago but now its unplayably laggy on specifically LA realms, Chicago is fine, I am also with Telstra.
I’ve found using a 3rd party program such as Exitlag or Mudfish as a temporary fix for now.
Praying whoever’s at fault weather it be Telstra or Blizzard will be able to fix the issue soon.
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Will make sure to do that. Any attempt in the past has always ended up with the scripted replies from their “customer support specialists”. I’ll hound them until they listen this time.
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100% trying to get anything out of them is like pulling teeth
Even then they still try to hit you with the classic “try restarting your router”
I had to absolutely drill into them that the issue was along the Telstra network and they needed their people to look into it, was nothing to do with my home internet and it was affecting multiple people across Aus
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The previous time I had the pleasure of dealing with them I had NBN issues, with the box on my property being damaged. It took dozens of chats with different “specialists” before I got one that could type off script and in unbroken English.
A few days after talking with that person a technician came and fixed the issue. All it took was a single person actually speaking to me.