Several peaks of lag

Our load testing shouldn't cause problems like this. To help identify where the problem is, please download WinMTR and run it for at least 100 pings with the "Host" set to whichever gateway you normally connect to:

us.login.pathofexile.com
eu.login.pathofexile.com
sng.login.pathofexile.com

Post the output here, or email it to me at support@grindinggear.com