Seeing consistent network spike latencies in random instances

Referring to this thread: https://www.pathofexile.com/forum/view-thread/1377789

In random instances when I join, some instances I observe consistent network latencies of 100-500ms for long durations

Adding my pastebin here: https://pastebin.com/NE5hDGFH

Thanks for the WinMTR log. Unfortunately, it doesn't appear to show any issues.

Did the IP address used for the test belong to one of the 'bad' instances?

The host ip address used for the test was 209.192.140.220 and yeah I dont see any loss % there, but I did see a loss % of 27 for ip of 32.130.25.168

Could this be the culprit?

What I mean by my question is that you say some instances are affected; others aren't. Was the IP address you used for the test an example of an instance you were seeing lag spikes in? I can see the IP address cited by the test, but I have no way of knowing what you experienced while playing.

The test only has a chance of being helpful if you ran it against a troubled server.

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No; that's not the issue.

The final line is the server you played on - 453 pings were sent to the server; 453 pings were received by the server; 453 responses were received by your computer from the server. 0% packet loss.

The earlier lines are all routers between you & the server. Their job is to pass your traffic to whatever is next in line - it doesn't matter what percentage of pings they respond to, as playing Path of Exile doesn't involve sending any traffic directly at them at all. The test only does this so that if there is packet loss affecting your connection to the server, it is possible to see where that packet loss originates. So long as the final line shows no packet loss, no dropped packets earlier in the test matter. That's usually just caused by routers intentionally deprioritising ICMP traffic, anyway.