Good morning and thank you for posting on the Final Fantasy XIV Technical Support Forums.

It sounds like the wireless connection may be the issue. When you connect it with an Ethernet cable, the latency is within the normal range (150-200 ms), correct? Since you are connecting to the NA Data Center from Europe, there will naturally be a little lag and it looks like this wireless connection is exacerbating it. If you didn't have issues when you played before, there must have been a change in your connection. Do you recall anything changing on your PC or your connection since you stopped playing in August?

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