I struggle with incredible lag since the last event ended...

Two Videos that show different scenarios, where the lag happens.


The problem is with the account, not a hardwareproblem.

What did I do already:
- Clean install + full client
- Full scann
- Every possible settingchange
- Let friend log in to my acc via teamviewer, he got the same lag, while his account doesnt lag at all
- found another person in Discord who has the same issue
- Set Game to Windows 7, 8 and 10
- tested it on my Laptop aswell
- Installed a VM with vista in hopes that bad specs would work, sadly not...

I have no clue what to do beside creating a new account (entirely, not character!)

Anyone here that could help me out?

Ty in advance