Some update info. I resetted my router, which haven't helped a bit ofc, and began to wonder what could I do to take an upper hand on those lags and 90k. And here's what I've done - I set up DNS as following:
- preferable - as my router IP
- secondary - 8.8.8.8 (which is known to be Google's DNS-server IP)
After that I ran some dungeons, stood some time in Revenant's Tall, and so far it seems to be OK. Routing problem after all? Almighty Google saves the day?
I hope this will help me and many others who battle their ways through the fields of lags.