here are the traceroute results + tests done with winMTR (adviced by noneed)
Should note that usually cross realm connection is less stable (getting 5-30s lag spikes) than it was doing this test (had 2s at most), even though it was still far from great.
The issue doesn't appear playing any other games or different mop servers (even if Im using the same client)
Here's a longer description on how the problem looks from my side (as a player)
I que up for arena
Play 2-3 games with perfectly stable ms
Then on my 3rd - 4th game I'll start getting really laggy
while I'm lagging I either have delay on what's happening (people standing near the pillar, in my line of sight, on my screen but I'm not able to hit them) OR everything completely freezes for awhile, then speeds up to the present and keeps repeating (as I mentioned 5-30 second lag spikes, that just keep happening until I obviously lose the arena)
Once either of these 2 starts happening, I won't be lagging outside arena (most of the time at least) but as soon as the arena game starts it will start again.
I've tried:
Deleting cache
Disabling all the addons
Fixing my characters on the site
Flushing dns
Reinstalling the client
Playing with the launcher / playing without the launcher
Playing through a different client (warmane)
Playing on a different computer (same IP)
Playing from a different IP & a different computer (same internet provider)
Problem happens on every account I play and has been happening ever since Pandawow moved it's host