Try getting evidence together with something like winMTR that will log the activity over a duration so you can track the trends in your connection. You can use this information to report it directly to SE, your ISP or even identify issues on your own end (i.e. you see packet loss or high latency directly from your router or external IP).

Instructions here:

Tracking packet loss with WinMTR

This has helped me in other online games as well. We've got a ton of people posting several topics on this issue so my hope is that we can get enough folks together with solid evidence and get some movement on the issues folks have been having with lag. If enough people end up showing the problem is on SEs or a particular provider, at least folks won't have to speculate anymore.

Best of luck.