Really bad latency spikes.

First you should make sure nothing else is using your connection, e.g. torrents, other people on your LAN, or background downloaders (such as Pando). You should also try closing any torrent programs even if they're not currently downloading, as we've had reports that some of them can cause spikes like you described even when they're idle.

If the problem keeps happening, please download WinMTR and run it for at least 100 pings with eu.login.pathofexile.com as the "Host" while you are experiencing these latency spikes. Either post the output here or email it to me at support@grindinggear.com .