Yoshida: I'm afraid there is not enough information in terms of how bad the latency is. So if possible could that person provide us with more information on the official forums like where they live, who their internet service provider is, what world they are connecting to, and any sort of ping information they can gather? Or else I'm afraid it is difficult to provide an accurate answer to that. Would you happen to have any information on-hand right now?
I have intermittent issues. On most days I can play Machinist and weave a skill between every Heat Blast with no issues, but on some days, I will play exactly the same way but the 5th Heat Blast in Hypercharge will get halfway through its animation before canceling itself.

I live in the US midwest. My ISP is Spectrum and I am connecting to Faerie. My ping to Aether datacenter (using the address listed on https://arrstatus.com/) is currently about 70 ms. The next time I have issues with latency, I will be sure to record my ping and a video of the issue and report it here.