Game laggy (for area and worse for spawns)

Today I had some spawns in the south-west of the new map.
My char kept teleporting back a few seconds having rubber band walks.
The HP was laggy too. (Healing… full… and now I am dead (100% → 0) within 0.5 seconds of another lag)

The game had problems in that area - so it might have been a problem with the server/instance + 20-ish enemies being spawned at once, me walking through them - being blocked → client and server got out of sync → so updates happened – while I attacked the enemies → which started some new updates of enemies – …

(at least that was I could see while I tried to stay alive)